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Bump and Normalmapping are giving you the same results if you use a heightmap as input. Both approaches have their advantages. With bump mapping you can easily control the intensity of the effect by just scaling the input height value, with normal mapping this is a bit more complex. With normal mapp...

RGB vs. spectral rendering is basicly like comparing "wrong vs. right". RGB rendering is wrong as soon as you start to add color to your light. While materials can be described quite decent with RGB colors since they usually have a rather smooth spectrum, RGB totally fails for most lightso...

First of all: As long as you render RGB your results will be wrong (except of some special cases). In order to do anything real you need to use spectral rendering, otherwise the metamerism will take care of everything being just wrong. That being said: converting everything to a common colorspace ca...

I don´t get it...

So what kind of drugs does one need to take in order to make any sense of this? Or is it just supposed to be some sort of modern art?

The more interesting question to me here is: How much do you loose by accumulating the values in XYZ instead of accumulating them in a true spectral buffer and convert the accumulated result afterwards? Especially with fluorescence this would be very interesting to evaluate.

I am not sure what your target audience will be by in my opinion you will most likely need version 1 anyways if you want to support dynamic scenes with many triangles. Every rebuild algorithm I know is still to slow to handle 50+ MTriangles at 30fps or so. I also don´t understand why spatial splits ...

This is why we artificially inflated the water in order to guarantee a gap between the water interface and the glass interface. Because of our prioritization scheme, you'd put water on the "stack", but would not enter water until you leave glass. I encourage you to read the paper. Also, I...

A volume stack sounds like an interesting option but how would you handle the intersection in this case? In real life you often have different tessellations for the glass model and the water model. How should the intersector detect if he has hit the right surface? Or how can you make sure to hit the...

Yes, CPU SIMD raytracing (and efficient multithreading and clustering) is still worth it, especially in a professional environment. Now I am probably quite a bit biased about this but there are a couple of reasons why CPU raytracing will continue to live on: #1: No driver issues or dependencies. If ...

I think it will be very interesting to see how haswell performs with optimized AVX code since it is the first CPU where you can actually use it (before that the absent of integer instructions was an absolute showstopper since you were forced to constantly switch between AVX and SSE which, by definit...