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1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 | #!F-adobe-helvetica-medium-r-normal--18*
#!N
#!CSeaGreen
#!N #!Rrendmdl Rendering Model #!N #!EC #!N #!N The interpretation of
"colors" and "opacities" differs between surfaces and volumes. For surfaces, a
surface of color #!F-adobe-times-medium-i-normal--18* c[f] #!EF and opacity #!F-adobe-times-medium-i-normal--18* o #!EF
are combined with the color #!F-adobe-times-medium-i-normal--18* c[b] #!EF of the objects
behind it, resulting in a combined color #!F-adobe-times-medium-i-normal--18* c[f]o + c[b]
(1 - o) #!EF . #!N #!N For volumes, the "dense
emitter" model is used, in which the opacity represents the instantaneous
rate of absorption of light passing through the volume per unit
thickness, and the color represents the instantaneous rate of light emission
per unit thickness. If #!F-adobe-times-medium-i-normal--18* c(z) #!EF represents the color of
the object at #!F-adobe-times-medium-i-normal--18* z #!EF and #!F-adobe-times-medium-i-normal--18* o(z) #!EF represents
its opacity at #!F-adobe-times-medium-i-normal--18* z #!EF , the total color #!F-adobe-times-medium-i-normal--18*
c #!EF of a ray passing through the volume is given
by: #!N c = integral to infinity from - infinity c
( z ) 'exp' (- integral to z from - infinity
o ( zeta ) d zeta) dz #!N #!N #!N #!N
#!F-adobe-times-medium-i-normal--18* Next Topic #!EF #!N #!N #!Lall1133,dxall1134 h Tiling Options #!EL #!N #!F-adobe-times-medium-i-normal--18* #!N
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