The RenderMan Interface - Paul Bourke

Image Forward Axis Up Axis Right Axis
px +X +Y -Z
nx -X +Y +Z
px +Y -Z +X
nx -Y +Z +X
px +Z +Y +X
nx -Z +Y -X
Notice that cube face environment maps are sensitive to the handedness of the coordinate
system in which they will be accessed. Environment maps which are intended
to be accessed in a right-handed coordinate system will, if displayed, appear as a
mirror image of those intended to be accessed in a left-handed coordinate system.
The fov is the full horizontal field of view used to generate these images. A value
of 90 degrees will cause the cube face edges to meet exactly. Using a slightly larger
value will cause the cube faces to intersect. Having a slight overlap helps remove
artifacts along the seams where the different pictures are joined.
RIB BINDING
MakeCubeFaceEnvironment px nx py ny pz nz texturename fov filter swidth twidth
...parameterlist...
The filter parameter should be one of ”box”, ”triangle”, ”catmull-rom”, ”b-spline”, ”gaussian”
and ”sinc”. These correspond to the predefined filter functions described with
RiPixelFilter.
EXAMPLE
RiMakeCubeFaceEnvironment(”foo.x”, ”foo.nx”, ”foo.y”, ”foo.ny”,
”foo.z”, ”foo.nz”, ”foo.env”, 95.0,
RiTriangleFilter, 2.0, 2.0, RI NULL);
SEE ALSO
RiMakeLatLongEnvironment, environment() in the Shading Language
7.1.3 Making shadow maps
Shadow maps are depth buffer images from a particular view. They are generally used in
light source shaders to cast shadows onto objects. A shadow map is accessed by point in
the camera coordinate system corresponding to that view. This point must be computed
in the shader. A shadow map texture can be accessed using the shadow function of the
Shading Language. The shadow function requires the name of a texture file containing the
texture.
RiMakeShadow ( char *picturename, char *texturename, ...parameterlist...)
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