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user 48
16
votes
Accepted
Why does graphics speak of "dielectrics" rather than insulators?
Strictly speaking, dielectrics are not necessarily insulators. For example, salt water is a reasonable conductor but also a dielectric.
The term "dielectric" tends to show up in discussion of the Fre …
- 25.3k
1
vote
Accepted
Converting from RGB Color Picker to Surface Reflectance
Yes, I think you're right. The values from a typical color picker would be in a gamma encoding or sRGB encoding and would need to be converted to linear to use as reflectance. This is probably just a …
- 25.3k
1
vote
Accepted
Confused on reflection coeffcient of Fresnel equations
We have $t_{12} = t_{21}$, by the law of reciprocity. Also, $$r_{12} + t_{12} = 1\\r_{21} + t_{21} = 1$$
It follows that $r_{12} = r_{21}$ as well.
- 25.3k
6
votes
Accepted
Mimicking Blender's "roughness" in my path tracer
For explicit light sampling: yep, you just evaluate the BRDF for that incoming direction and the output direction back toward the camera. There's probability involved in the case of an area light: you …
- 25.3k