Graphics Programs Reference
In-Depth Information
The 3D section of the Preferences panel
includes the 3D ile loading limitations.
In this section, you can limit the Active
Light Source that Photoshop can
import, which can help importing iles
more quickly, especially when the
source ile includes too many light
sources.
You can also limit the Default Difuse
Texture Limit to control the maximum
number of textures that can be
imported into Photoshop.
Working with the
Mesh Shadows
When you render the 3D models using
the Ray Trace, which is one of the
high-quality rendering options that
relies on calculating the shadows and
light applied on the object to create
better rendering results, you can display
shadows on the object or the object's
shadow on the ground. In the Mesh
section of the 3D panel, you can edit the properties of the shadows that are
applied to the object (Figure 4.4):
Note: The shadows'
values apply to each
mesh in the model
separately. However,
you have to set the
shadows' values for
each mesh in the
object.
Figure 4.3   The 3D panel.
1. The Catch Shadows option lets the mesh display shadows from itself. For
example, an object that includes many details can have shadows appear
from its own mesh over other parts in the mesh.
2. The Cast Shadows option allows the mesh to display the shadows
applied to it from other meshes and objects around it.
3. The Shadow Opacity value ranges from 0-100% and controls the visibility
of the shadows that appear on the mesh. The shadow opacity is also
afected by the global ambient color. So if you have a 50% grey global
illumination set, your shadows will start at 50% (with the Opacity set
at 100%).
In the natural scenes around us, the light doesn't just afect the object and
create a shadow for it; it also creates shadows for the object details on itself,
and the object is afected by the other objects around it and gets shadows
from them on its surface. However, the Catch and Cast Shadows options are
important to give the 3D model a realistic look and feel and a uniied style
with the objects around it.
In the following example, you will see how the Cast and Catch Shadows
options afect the mesh of the model and the environment around it:
 
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