Tag Archives: reflections

Shading and Lighting

shading_and_lighting

So, while setting up my laptop to handle the 3D freelancer thing, I been thinking about writing a book about shading and lighting, not that I know much about it, but because I want to share my approach, at least for starters, it can help others to understand another way of thinking about shading and lighting in 3D. No book for now, not even soon I believe, have a read and let me know if you would like more information like this.

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Custom Fresnel curves in Maya

custom_fresnel_curves_maya

So, we all know about fresnel reflections, objects reflect more at grazing angles. A few years ago we would use the facing ratio and a ramp to achieve that effect, and then reverse the result in the diffuse to keep somehow a physical based workflow. With more recent shaders and render engines we can drive the reflection with the index of refraction (ior or n) which works great for dielectric materials (plastic, wood, etc) but for metals the index of refraction is a bit more complex and very few render engines have gone through the trouble of writing those more complex reflection formulas. The question is: does it make any difference at all? Can’t we just tweek it until “looks good”? Sure we can, after all it’s all about art, making it look good, and realism is not always pleasing. So don’t take this too serious, but in the end you might learn something.

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