The RenderMan Interface - Paul Bourke

Name Type Storage Class Description
P point varying Surface position on the light
dPdu vector varying Derivitive of surface position along u
dPdv vector varying Derivitive of surface position along v
N normal varying Surface shading normal on the light
Ng normal varying Surface geometric normal on the light
u,v float varying Surface parameters
du,dv float varying Change in surface parameters
s,t float varying Surface texture coordinates
L vector varying Outgoing light ray direction*
Ps point varying Position being illuminated
E point uniform Position of the eye
ncomps float uniform Number of color components
time float uniform Current shutter time
dtime float uniform The amount of time covered by this shading
sample.
Cl color varying Outgoing light ray color
Ol color varying Outgoing light ray opacity
* Available only inside solar or illuminate statements.
Table 12.2: Predefined Light Source Variables
Name Type Storage Class Description
P point varying Light ray endpoint
I vector varying Ray direction (pointing toward P)
E point uniform Position of the eye
Ci color varying Ray color
Oi color varying Ray opacity
ncomps float uniform Number of color components
time float uniform Current shutter time
dtime float uniform The amount of time covered by this shading
sample.
Ci color varying Attenuated ray color
Oi color varying Attenuated ray opacity
Table 12.3: Predefined Volume Shader Variables
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