extend the materialNode class with refractive materials

added illumination model and refractive index to MaterialNode class. This is necessary for physically-based rendering (GI course)

changed title from extend the materialNode class with refractive materials to WIP: extend the materialNode class with refractive materials

added 1 commit

• 0b8fb87a - extend the materialNode class with refractive materials

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changed title from WIP: extend the materialNode class with refractive materials to extend the materialNode class with refractive materials

added 1 commit

• 51538514 - Renamed a function

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Changed function names to match the others in the class. You have to adapt the other patches to follow this change @jkalojanov

mentioned in commit 3b79dc5f

merged