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edge effect, computing, 187
Effects Browser, from NVIDIA, 140, 141
electric field, of a wave of energy, 64, 65
element-by-element addition. See piecewise addition
element-by-element multiplication. See piecewise multiplication
element index, using when a MET surface is set to the sampler, 287
element masks, 269
else instruction, 217
emissive color, 34
emissive light, perceiving detail from, 23
emissive lighting, 35
endif instruction, 217-218
endloop instruction, 218-219, 234
endrep instruction, 219-220
energy, calculating the percent transmitted or reflected, 66
Engel, Wolfgang, 145
engraving style, 81-82, 83
environment, light reflected from, 39
environment illumination, 34
environment mapping, 348-350
execution time
of instructions and macroinstructions, 204
of rcp, 257
of rsq, 260
exp instruction, 301-302
exp macro, 220-221
expp instruction, 220, 221-223
eye
gamuts of, 24
perceptiveness of, 23
eye direction, specular highlights varying with, 352
eye position, 151. See also viewer position
eye space, 98
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