Search found 37 matches

by Serendipity
Mon Sep 29, 2014 7:04 am
Forum: General Development
Topic: questions about displacement, normal and bump
Replies: 4
Views: 3350

Re: questions about displacement, normal and bump

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...
by Serendipity
Tue Aug 19, 2014 3:37 pm
Forum: General Development
Topic: Comparison of spectral vs rgb rendering?
Replies: 9
Views: 7398

Re: Comparison of spectral vs rgb rendering?

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...
by Serendipity
Tue Jun 10, 2014 1:59 pm
Forum: General Development
Topic: Color space: when to multiply by the matrix
Replies: 13
Views: 7665

Re: Color space: when to multiply by the matrix

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...
by Serendipity
Mon Dec 02, 2013 1:38 pm
Forum: Visuals
Topic: ket is for horses
Replies: 4
Views: 7886

Re: ket is for horses

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?
by Serendipity
Wed Nov 27, 2013 2:01 pm
Forum: General Development
Topic: Frame buffer for spectral rendering
Replies: 8
Views: 5689

Re: Frame buffer for spectral rendering

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.
by Serendipity
Wed Sep 11, 2013 2:40 pm
Forum: General Development
Topic: BVH instances support : approaches
Replies: 12
Views: 8700

Re: BVH instances support : approaches

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 ...
by Serendipity
Tue Aug 13, 2013 6:43 am
Forum: General Development
Topic: Best method for IOR
Replies: 9
Views: 5392

Re: Best method for IOR

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...
by Serendipity
Mon Aug 12, 2013 8:33 am
Forum: General Development
Topic: Best method for IOR
Replies: 9
Views: 5392

Re: Best method for IOR

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...
by Serendipity
Sat Jun 22, 2013 11:26 am
Forum: General Development
Topic: Is it still worth it to do CPU SIMD ray tracing?
Replies: 12
Views: 10070

Re: Is it still worth it to do CPU SIMD ray tracing?

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 ...
by Serendipity
Wed Mar 20, 2013 6:24 pm
Forum: Links & Papers
Topic: Haswell benchmarks show up
Replies: 20
Views: 16347

Re: Haswell benchmarks show up

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...

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