# iamyoukou

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Programming
1. ## Snow physics in Red Dead Redemption 2

So much useful information! Thanks : )
2. ## Snow physics in Red Dead Redemption 2

Nice! Let me check these videos. Thanks : )
3. ## Snow physics in Red Dead Redemption 2

I'm very interested in the snow physics in Red Dead Redemption 2. Here is a demo video from YouTube. Does anyone know the techniques behind this snow physics? For example, What is the shading model of the snow? How do they create snow deformation?
4. ## How to compute normal vectors for gerstner waves

Thank you for the code : ) I think  N = cross(T, B) in your code is more reasonable than the equation (12) in that article. Thanks again  :)
5. ## How to compute normal vectors for gerstner waves

The equations for calculating tangent and bi normal vector are (10) and (11). The article also gives a result of the cross prod you mentioned (equation 12), but it doesn't show the whole calculating steps. And I don't understand some part of those missing steps :( By the way, sorry for not showing equation (10) ~ (12), I will edit my post.
6. ## How to compute normal vectors for gerstner waves

I'm reading the article of ocean surface simulation based on gerstner waves in this book: http://http.developer.nvidia.com/GPUGems/gpugems_ch01.html But I don't understand how to compute the normal vectors (equation 10 ~ 12). Currently, I got [attachment=35446:question_0.png] It seems that the article makes the following assumption [attachment=35447:question_1.png] But how is that possible? Or did I miss something?   ================================= edited, 2017.03.28, 08:30 ================================= The bi normal vector is (equation 10) The tangent vector is (equation 11) The normal vector given by the article is (equation 12) I don't understand how they cancel out those summation terms (e.g. part 1a and part 1b).