With this panel you can control how objects using this material cast and receive shadows. The shadows that appear in a scene are affected by a combination of the layout of objects, the shape of the objects, the materials of the objects, and the lighting. In Blender, the Display Mode (single-texture, multi-texture, or GLSL) also affects the appearance of shadows. See Shadows for a more complete description of this subject.
Shadows in 3D mode
To see shadows in 3D (textured) mode, you must have switched to GLSL mode before making any materials. In MultiTexture mode, shadows only appear in the rendered image: none of these can be seen in the preview image.
The Shadow panel in the Materials Properties editor (see Fig. Shadow panel.) controls the effects that the material can have on the shadows that appear in the scene. The various properties are described in the sections below.
The following properties can be set for each individual material with which objects in the scene are shaded. The effects are illustrated with rendered images for a simple scene (Fig. Scene with all shadow properties off.) consisting of two «posts», one with a red (totally non-transparent) material; one green (partially transparent) material, set up on a light blue plane to receive the shadows. The illustrations were all taken in Blender Renderer, with Multitexture mode.
Shadow-Receiving Object Material¶
The following options affect the material that receives shadows:
- Allows this material to receive full-intensity shadows (Fig. Plane with Receive.).
- Receive Transparent
- Allows this material to receive shadows whose intensity is modified by the transparency and color of the shadow-casting object (Fig. Plane with Receive and Receive Transparency.).
Shadow-Casting Object Material¶
The following options affect the material that casts shadows:
- Cast Only
- Causes objects with the material to only cast a shadow, and not appear in renders. (Fig. Posts with Cast Only.).
- Casting Alpha
- Sets the Alpha of shadow casting. Used for irregular and deep shadow buffering.
- Shadows Only
Renders shadows as materials alpha value, making materials transparent, except for areas where it receives shadows from other objects, and also it retains its own transparency (Fig. Posts with Shadows Only.). Note the faint image of the partly-transparent post.
- Shadow Only Type
Set the type of shadows used when Shadows Only is enabled.
- Shadow and Distance
- Shadow Only
- Shadows and Shading
Buffered Shadow Options¶
In addition to the shadow options described above, there are further material properties which control buffered shadow features. See section on Spot Buffered Shadows for further discussion of these techniques.
- Cast Buffer Shadow
- Casts shadows from shadow buffer lamps.
- Buffer Bias
- Multiplication factor for Buffer shadows (0 = ignore).
- Auto Ray Bias
- Prevent ray-traced shadow errors on surfaces with smooth-shaded normals.
- Ray Bias
- Shadow ray-tracing bias value to prevent terminator artifacts on shadow boundary.
- Cast Approximate
- Allow this material to cast shadows when using approximate ambient occlusion.