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Download "Building Realistic 3D Scenes With Cocos Creator"

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Table of contents
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Table of contents

0:04
Materials
0:08
Lighting
0:10
Shadows
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Cocos
Cocos Creator
Cocos2d-x
Cocos2d
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shaders
game shaders
game development
game tutorial
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typescript
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opengl
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unity
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cascading shadows
GGX ambient
Anisotropic lighting
model preparation
importing
camera
environment
lights
lightmap baking
reflection
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Subtitles

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  • ruRussian
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00:00:01
hello and welcome
00:00:03
cocos creator 3.6 is now released with
00:00:05
many new features and improvements
00:00:07
especially when it comes to rendering
00:00:09
with new updates in lighting materials
00:00:11
and the particle system now is
00:00:13
definitely a great time to get on board
00:00:15
if you are new to coco's creator
00:00:17
and today we are going to take a look at
00:00:19
the complete process of 3d scene
00:00:21
creation in coco's creator
00:00:24
our viewers with an artistic background
00:00:26
are probably no stranger to importing 3d
00:00:28
models into a game engine
00:00:31
prior to import we need to prepare the
00:00:33
model first so that it will work
00:00:34
properly in the engine
00:00:36
it is typical to place the anchor point
00:00:38
of the model at the world origin
00:00:41
we can also strategically put anchor
00:00:43
points at the joints where models attach
00:00:44
or use grouping and parenting so that we
00:00:46
can create fk animations with ease
00:00:50
uv unwrapping is also an important job
00:00:52
in the modeling phase
00:00:54
in cocos creator models are required to
00:00:56
have two sets of uvs
00:00:58
the first uv set is used for textures
00:01:01
and materials and is no different than
00:01:02
the uvs typically used for rendering 3d
00:01:05
models
00:01:06
we can decide the scale of uv islands or
00:01:08
whether there is any overlapping with a
00:01:10
level of flexibility
00:01:12
the second set is used to bake light
00:01:14
maps in coco's creator
00:01:16
for this set no uv overlapping is
00:01:18
allowed and uv islands are required to
00:01:21
be positioned within udim1001
00:01:25
with the two sets of uvs in place we are
00:01:27
ready to export the models
00:01:29
export the model in fbx format and make
00:01:32
sure the axis pointing upward is set to
00:01:34
y
00:01:35
there are many ways to create 3d models
00:01:37
and coco's creator supports all the
00:01:39
common workflows
00:01:41
we can use high poly mesh low poly mesh
00:01:43
with a baked normal map or mesh with
00:01:45
modified vertex normal to populate our
00:01:47
scene each with their own strengths and
00:01:49
caveats
00:01:51
now that we have our model exported in
00:01:53
the fbx format we can import the model
00:01:56
in coco's creator
00:01:58
importing assets can be easily done by
00:02:00
dragging and dropping the asset from its
00:02:02
directory into the assets panel
00:02:04
once imported we can select the fbx file
00:02:07
in the assets panel and we will gain
00:02:09
access to all the properties of the
00:02:10
asset in the inspector panel to the
00:02:12
right
00:02:13
we don't have to worry about most of
00:02:15
these properties throughout the process
00:02:17
of building our scene
00:02:19
they can be left at their default values
00:02:21
to add the model to the current scene we
00:02:23
can drag and drop the model from the
00:02:25
assets panel into the scene panel
00:02:28
afterwards we can find the model we just
00:02:30
added in the hierarchy panel and where
00:02:32
it is in the hierarchy along with all
00:02:34
the other nodes each model we added in
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the scene is an instance of the fbx we
00:02:39
imported
00:02:41
we are free to assign new materials to
00:02:43
the model and modify its properties
00:02:44
without having to worry about making
00:02:46
unwanted changes to the model asset
00:02:49
if we want more instances simply
00:02:51
duplicate the instance we just added to
00:02:53
the scene or drag and drop more
00:02:54
instances to the scene from the assets
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panel
00:02:59
we can use the move rotate and scale
00:03:01
tools to place the model where we want
00:03:03
it to be
00:03:04
each node in the scene has their own
00:03:06
position rotation and scale properties
00:03:08
which are accessible in the inspector
00:03:10
panel when the model is selected
00:03:12
as we position the model with the move
00:03:14
rotate and scale tools we are in fact
00:03:16
modifying its position rotation and
00:03:18
scale properties in the inspector panel
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therefore we can enter specific values
00:03:24
to the properties and it will get the
00:03:25
same result
00:03:28
models are not the only thing we can add
00:03:30
to the scene
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we can also add other nodes to the scene
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such as cameras which is important in
00:03:35
telling the engine how the players view
00:03:37
and experience the scene
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we already have a camera that is
00:03:41
automatically created for us
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alternatively we can manually create a
00:03:45
camera by clicking the plus sign button
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on the upper left of the hierarchy panel
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and select camera
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we can move rotate and scale the camera
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just like with models
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while doing so a preview window will
00:03:57
appear on the lower right of the scene
00:03:59
panel that gives us the current view as
00:04:01
seen by the camera which will also be
00:04:03
the view the player sees when playing
00:04:04
the scene
00:04:06
when exporting the model we already
00:04:08
incorporated the material in the fbx
00:04:11
file
00:04:12
but as we can see the material does not
00:04:14
come through when it is imported in
00:04:16
coco's creator
00:04:18
this is because all materials are
00:04:19
instantiated from their respective
00:04:21
shaders which tend to vary across
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different applications
00:04:24
3d content creators have their own
00:04:26
unique shaders while coco's creator has
00:04:28
its own
00:04:30
the two cannot translate into one
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another without some kind of
00:04:33
intervention
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the result is materials being unable to
00:04:36
be exported and imported in a simple and
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direct manner
00:04:40
so where can we access the materials of
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the model
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select the model in the scene look for
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the materials property in the inspector
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panel click the arrow button and we will
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get a list of all the materials being
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used by the model
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to give the model a material first we
00:04:55
need to create a material asset
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click the plus sign button in the assets
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panel and select material
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a new material asset will be created and
00:05:04
added to the assets of the project
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materials contain all the rendering
00:05:09
properties such as color and
00:05:10
reflectivity that conveys the physical
00:05:13
attributes of an object
00:05:15
shaders in coco's creator use the metal
00:05:17
roughness workflow in pbr rendering
00:05:20
to work with it we can create texture
00:05:22
maps such as normal albedo roughness and
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metallic
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import the texture maps in the assets
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panel and drag and drop them in their
00:05:29
respective properties in the material
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once the material is done click the tick
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button on the upper right of the
00:05:36
inspector panel to save the material
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asset
00:05:39
to assign the material to the model
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select the model
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drag and drop the material asset from
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the assets panel to the materials
00:05:47
property replacing what is already there
00:05:50
you are probably wondering why is the
00:05:52
material assigned to the model added to
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the scene rather than the fbx file in
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the assets panel
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as mentioned before models in the scene
00:06:00
are instances of the fbx file imported
00:06:03
we can assign different materials to the
00:06:05
same model in the same scene
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for example our scene requires a marble
00:06:10
bust and a bronze bust but we have only
00:06:12
one model for the bust
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all we need is a marble material and a
00:06:16
bronze material then assign the two
00:06:18
materials to different instances of the
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bust
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the two won't interfere with one another
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and we can even create yet another
00:06:25
version of the bust by creating a third
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material
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we are done with models for now
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let us save the progress so far
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go to the top menu bar and select file
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save scene or save as to save the
00:06:40
current scene
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save scene is also an asset that can be
00:06:44
found in the assets panel
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double-click on it to open the scene
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we now have models in the scene but the
00:06:53
surrounding is completely empty
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it'd look better if we could add a
00:06:57
background to the scene to provide some
00:06:59
sense of ambiance
00:07:00
to do so we need a hdri map
00:07:03
in cocos creator only hdri maps in hdr
00:07:07
format are supported
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if the map you intend to use is of the
00:07:10
exr format it can be easily converted by
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opening it in an image processor such as
00:07:15
photoshop and saving a copy in the hdr
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format
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importing hdri maps is no different than
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importing any asset
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drag the hdr file from its directory and
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drop it in the assets panel
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to use it select the root note of the
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hierarchy of the scene which has the
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same name as the scene itself
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under the skybox tab in the inspector
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panel drag and drop the hdri asset into
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the envmap property
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also make sure enabled is ticked on
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in addition we need to select the camera
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in the scene
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open the drop down menu of the clear
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flags property and select skybox
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doing so will make the hdri map appear
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at runtime as opposed to being only
00:07:57
visible in the editor
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our scene now looks much more believable
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compared to before
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we can adjust the exposure level of the
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hdri map with the skyline property
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we also have access to sky lighting
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color and ground lighting color which
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represent the sky ambient color and
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ground reflectance color
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these colors have already been
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automatically generated for us but they
00:08:18
can be modified as well if we are not
00:08:20
happy with the way the models and the
00:08:22
background blend
00:08:24
other than ambient lighting we also need
00:08:26
to create and place light sources in the
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scene
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our scene has a directional light
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created by default
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we can adjust its position rotation
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scale and other properties the same way
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as with other nodes
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in coco's creator we have access to
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three types of light directional light
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sphere light and spotlight
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directional lights illuminates the scene
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ubiquitously in a given direction which
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mimics the sunlight in exterior
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environments
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as its name suggests the rotation
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property determines the direction in
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which the light is emitted
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moreover we can adjust its intensity
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color and color temperature properties
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which alter the light's illuminance and
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color to fit our artistic vision the
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position property has no impact when
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using a directional light
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because directional lights illuminate
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the entire scene indiscriminately and
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produces the same lighting effect as
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long as the rotation and intensity
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property remain
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unchanged sphere light has a
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sphere-shaped light source and
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illuminates in all directions around the
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emitter
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the rotation property has no impact on
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the lighting effect as it illuminates
00:09:31
ubiquitously in all directions
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sphere light's illuminants cannot reach
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the entire scene
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they can only affect a limited area
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which is why positioning them is most
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important when using sphere lights
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sphere light also has the intensity
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color and color temperature properties
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other than that we can also adjust the
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radius of the light source and the range
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in which the illuminance can potentially
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reach
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spotlight also has a sphere-shaped light
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source but illuminates in a cone-shaped
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area rather than in all directions
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it tends to leave a circular lit spot on
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the objects being shown on
00:10:05
in reality spotlights are frequently
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used in theaters and lighting studios to
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create specific lighting effects
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for spotlights the position property
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determines where the light originates
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from which is similar to sphere lights
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the rotation property determines the
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direction in which the light orients
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similar to directional lights
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spotlight also has the intensity color
00:10:28
and color temperature properties
00:10:30
the radius of the light source and the
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angle at which the cone area is spread
00:10:34
can also be adjusted
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to enable dynamic shadows we need to
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give models lights and the environment
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specific settings so that they can work
00:10:42
together
00:10:44
first the models
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select the mesh node of the model which
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is typically a child node parented to
00:10:50
the model node
00:10:51
set shadow casting mode to on which is
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found under the dynamic shadow settings
00:10:56
tab
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next the lights
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select all lights in the scene tick
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shadow enabled under the dynamic shadow
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settings tab
00:11:05
finally the environment
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select the root node which has the same
00:11:09
name as the scene tick enabled under the
00:11:12
shadows tab
00:11:13
coco's creator offers two types of
00:11:15
shadows planar and shadow map
00:11:18
planar is a simple solution to rendering
00:11:20
shadows
00:11:21
it can only be casted in a fixed
00:11:23
direction
00:11:25
if the object on which the shadow is
00:11:26
casted on has an uneven surface or it is
00:11:29
rotated at a certain angle the shadow
00:11:31
will penetrate the object as if it is a
00:11:33
mesh on itself
00:11:34
we can adjust the color of the planar
00:11:36
shadow with the shadow color property
00:11:38
and the direction in which the shadow is
00:11:40
casted with the normal property
00:11:43
shadow map can produce shadows with much
00:11:44
more details and can be casted on any
00:11:46
surface
00:11:48
to achieve the optimal result again we
00:11:50
need specific settings
00:11:52
firstly select the root note of the
00:11:54
scene adjust the value for shadow map
00:11:56
size under the shadows tab
00:11:58
this property gives us the resolution
00:12:00
for rendering shadow maps and should be
00:12:02
the first property to adjust if we see
00:12:04
no shadows even with shadows turned on
00:12:06
or the shadows are too low in quality
00:12:08
that they look like multiple rectangles
00:12:10
stacked together
00:12:12
secondly select the light set shadow pcf
00:12:14
to soft 2x or soft 4x under the dynamic
00:12:17
shadow settings tab
00:12:19
by default shadow maps are generated
00:12:21
with sharp jagged edges this property
00:12:24
enables algorithms to smooth out the
00:12:26
edges resulting in more realistic
00:12:28
looking shadows
00:12:30
thirdly select the light again adjust
00:12:32
the value of shadow distance under the
00:12:34
dynamic shadow settings tab
00:12:36
this property adjusts the distance from
00:12:38
which the shadow is casted resulting in
00:12:41
shadows in varying levels of details
00:12:43
with shadow pcf on shadows only require
00:12:46
a moderate level of fidelity and does
00:12:48
not require too much details
00:12:50
adjust the property until we get a
00:12:52
result we're happy with then return to
00:12:54
shadow map size and lower its value this
00:12:57
is to avoid wasting processing power on
00:12:59
unnecessarily high resolution for shadow
00:13:01
maps
00:13:02
finally select the root note of the
00:13:04
scene and adjust shadow saturation
00:13:07
this functions as the opacity of the
00:13:09
shadows casted
00:13:11
we have added lighting and shadows in
00:13:13
the scene
00:13:14
take note that lighting and shadows are
00:13:16
now dynamically generated which is not
00:13:18
the most efficient approach regarding
00:13:20
processing power especially when the
00:13:22
scene has over a dozen light sources
00:13:24
to overcome this lighting and shadows
00:13:26
can be rendered as a texture map so that
00:13:28
the processing power involved can be
00:13:30
released without compromising too much
00:13:31
of the image fidelity
00:13:33
to do so we need to give specific
00:13:35
settings to models lights materials and
00:13:38
the environment to work in conjunction
00:13:40
first the models
00:13:42
select the mesh of the model
00:13:44
take bakeable cast shadow and receive
00:13:47
shadow under the lightmap settings tab
00:13:49
bakeable adds the model to the lightmap
00:13:51
render queue
00:13:53
without it the model will continue to be
00:13:55
rendered with dynamic lights and shadows
00:13:58
cast shadow allows the model to cast
00:14:00
shadows
00:14:01
similarly receive shadow allows other
00:14:03
models to cast their shadows on the
00:14:05
current model
00:14:06
light map size determines the size of
00:14:08
the light map generated which is the
00:14:10
texture map to replace dynamic light and
00:14:12
shadows
00:14:13
we will come back to this property later
00:14:15
in the video
00:14:17
second the lights
00:14:19
select the light node in the scene tick
00:14:21
bakable and cast shadow under the static
00:14:23
settings tab
00:14:25
next the environment
00:14:27
select the root note of the scene
00:14:29
tick enabled under the shadows tab
00:14:32
this is the same property that produces
00:14:34
dynamic shadows in the scene
00:14:36
if you do not wish to have any shadows
00:14:38
incorporated in the light maps
00:14:41
switch this property off
00:14:43
finally the materials
00:14:45
select the material asset from the
00:14:47
assets panel
00:14:49
take use second uv
00:14:52
we are now ready to generate light maps
00:14:55
go to the top menu bar and select
00:14:57
project lightmap which opens the
00:14:59
lightmap baker panel
00:15:01
most of these properties do not require
00:15:03
our attention with a few exceptions msaa
00:15:06
this property gives crisper render
00:15:08
quality but will also significantly
00:15:10
increase render time in most scenarios
00:15:13
it can be set to a higher value to fix
00:15:15
quality issues such as blemishes and
00:15:17
smudges
00:15:18
resolution
00:15:19
as the name suggests this property
00:15:22
determines the resolution of the map
00:15:23
bait
00:15:25
ao color
00:15:26
after the first bake you may find that
00:15:28
ambient occlusion looks too weak in the
00:15:30
baked scene
00:15:31
this is likely due to the default ao
00:15:33
color being too bright to punctuate ao
00:15:36
for simplicity's sake set ao color to
00:15:38
black for the first bake switch to other
00:15:40
colors in subsequent bakes if necessary
00:15:44
to start baking click lightmap generate
00:15:47
select the directory where the bake
00:15:48
output will be located then assets
00:15:50
folder in your project directory by
00:15:52
default
00:15:54
we can take a preview of the light maps
00:15:56
generated under the bake tab once baking
00:15:58
is complete
00:16:00
as we can see light maps are generated
00:16:02
according to the model's second set of
00:16:03
uv which we prepared for the model
00:16:05
during the modeling phase in texture
00:16:07
chunks in varying sizes then put
00:16:09
together in one map
00:16:11
so the question is what determines the
00:16:13
size for these texture chunks and how
00:16:15
are they combined in one map
00:16:17
open a light map we just baked
00:16:20
we can see that its resolution is 1024
00:16:22
by 1024 which is exactly the value we
00:16:25
have in the resolution property in the
00:16:27
lightmap baker
00:16:29
lightmap baker will generate light maps
00:16:31
for all models according to their
00:16:32
lightmap resolution property then put
00:16:34
them in one map in the size as dictated
00:16:36
by the resolution property in the baker
00:16:39
if the model's light map size happens to
00:16:41
be identical to the baker's resolution
00:16:43
then the model's light map will have its
00:16:45
own separate map
00:16:47
should the model's light map size be
00:16:48
smaller than the baker's resolution the
00:16:50
model's light map will only take a
00:16:52
portion of a single map the rest of the
00:16:54
map will be reserved for other models
00:16:56
like maps to fill in
00:16:58
when all available space on one map is
00:17:00
taken light map baker will continue to
00:17:02
put light maps in a new map
00:17:04
to sum up as a general rule of thumb we
00:17:06
should always keep the model's light map
00:17:08
size lower than the baker's resolution
00:17:10
value
00:17:11
ideally light map size should be a pot
00:17:14
value namely 64 128 256 512 etc
00:17:20
this way we can not only get correctly
00:17:22
baked light maps but also fully utilize
00:17:24
the resolution of each map
00:17:27
with the light maps baked lights and
00:17:29
shadows are now rendered with light maps
00:17:31
and overlaid on top of materials
00:17:33
we can modify material properties
00:17:35
without having to worry about breaking
00:17:37
the light maps already baked as
00:17:38
materials do not affect how light maps
00:17:40
are rendered
00:17:42
however if we modify light properties
00:17:44
such as orientation intensity and color
00:17:46
with light maps on we will have to
00:17:48
re-bake them
00:17:49
if we no longer need baked light maps
00:17:51
for our scene we can return to the baker
00:17:53
go to the bake tab and click light map
00:17:55
clear
00:17:56
this will delete all baked light maps
00:17:59
lights and shadows will be processed
00:18:00
dynamically just like before
00:18:03
sometimes we bake the light maps but
00:18:04
realize that we are not entirely happy
00:18:06
with the lighting
00:18:08
this requires us to adjust light
00:18:10
properties which means we'll have to
00:18:11
re-bake light maps for the entire scene
00:18:14
until we are happy with the lighting we
00:18:16
have to repeatedly adjust light
00:18:17
properties and continue to rebake light
00:18:19
maps
00:18:20
this can be quite a chore
00:18:22
we mentioned earlier in this video that
00:18:24
cameras determine how the players see
00:18:26
our scene this is also true when it
00:18:29
comes to lighting
00:18:30
when adding lights to the scene our
00:18:32
primary goal should be to create the
00:18:34
light and shade relations so that our
00:18:35
models and materials are properly
00:18:37
presented
00:18:38
at this point the overall brightness is
00:18:41
less important
00:18:42
once we have a reasonably lighted scene
00:18:44
we can use the aperture shutter and iso
00:18:46
property of the camera to modify the
00:18:48
exposure level which alters the overall
00:18:50
brightness of the scene while preserving
00:18:52
all the shading nuances created with
00:18:54
lighting
00:18:55
this gives us a lot more flexibility and
00:18:57
avoids baking light maps over and over
00:18:59
again which can save us a lot of time
00:19:03
before we end this video there is one
00:19:05
more setting we need to do
00:19:07
right now in the scene we have models
00:19:09
lighting and materials in place but
00:19:11
there is still something missing
00:19:13
this is particularly apparent with
00:19:14
metallic materials as metals don't look
00:19:17
very convincing
00:19:18
metals typically have strong
00:19:20
reflectivity which is currently lacking
00:19:23
to add reflection select the root note
00:19:25
of the scene
00:19:26
in the drop down menu of the env
00:19:28
lighting type property under the skybox
00:19:30
tab select diffuse map with reflection
00:19:34
this property brings ambient lighting to
00:19:36
all the materials in the scene which
00:19:37
helps blending the models and the
00:19:39
environment in a more natural way
00:19:41
in addition click the bake button next
00:19:44
to reflection convulsion
00:19:46
this generates a convulsion map and adds
00:19:48
reflections to all the materials
00:19:50
reflection intensity can be adjusted
00:19:52
with the roughness property inherent to
00:19:54
coco's creator's default shader
00:19:57
take note however that ambient lighting
00:19:59
and reflections are reliant on the hdri
00:20:01
map we added to the scene
00:20:03
should the env map property be left
00:20:05
empty or the hdri map itself lack any
00:20:08
distinguishable visual details it is
00:20:10
less likely to get in satisfactory
00:20:12
result
00:20:15
thank you for joining us and hope you
00:20:16
enjoyed this introduction to 3d scene
00:20:18
creation in coco's creator
00:20:20
please stay tuned to our updates and we
00:20:22
will continue to bring new and
00:20:24
interesting content in future
00:20:26
see you soon

Description:

This tutorial shares how to export your 3D models into Cocos Creator, prepare the models with their perspective shaders, add cameras to the scene, add environmental lights and skymaps to the scene, lightmap baking, and adding reflections to your scene. This tutorial is for those using Cocos Creator 3.6 or later. You can download it for free from https://www.cocos.com/en If you have any questions about what is shown in this tutorial, please share a question in the comments.

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