DeleD Community Edition

[mbr4]

How to map DeleD material properties to OpenGL material parameters:
GL_AMBIENT, GL_DIFFUSE, GL_SPECULAR, GL_EMISSION, GL_SHININESS

No texture is used.

[Paul-Jan]

Assuming a single-layer material, the general properties only contain a single color, which maps onto DIFFUSE. The other properties can be tweaked to your liking, DeleD's visualization leaves them at the OpenGL defaults.

The raytracing properties contain explicit ambient, diffuse and specular components.. However, they are not used in DeleD's visualization, so how you want to map them is up to you. I wouldn't advise using the (still young and experimental) DeleD raytracer itself as a reference vizualization for realtime rendering.

One tricky part would be correctly mapping specular amount, exponent and color onto GL_SHININESS.
- GL_SHININESS is clamed to [0, 128]
- GL_SHININESS is interpreted as the Blinn-phong exponent, while the raytracer interprets the specular amount as classic phong and then does a post-scale with the specular amount.

This might be trivial to convert using the formula in the red book and the formula as used in the raytracer, but my right arm is in plaster atm so I can't write (or even type properly) AND as said before, I wouldn't suggest using the raytracer as a reference implementation as it might be erroneous and/or subject to change.

What I would do is
- feed specular exponent straight into GL_SHININESS
- multiply color with specular amount, then use that for GL_SPECULAR