#!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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