Unanswered Questions
11
votes
0answers
231 views
Ocean Wave Rendering
How could I generate the waves for a water body with whitecaps & foam and variable intensity of the waves? Is the surface a mesh with a normal map? Is there a formula for generating that? Is there ...
11
votes
0answers
371 views
What exact algorithm and parameters reproduce L-system plant growth figure in Algorithmic Beauty of Plants
I am interested in duplicating a figure (shown below, ch 1 fig 1.21) in the book Algorithmic Beauty of Plants. The book is available here
http://algorithmicbotany.org/papers/#abop
This image appears ...
10
votes
0answers
247 views
What is my GPU waiting on?
I am writing an OpenCL program for use with my AMD Radeon HD 7800 series GPU. According to AMD's OpenCL programming guide, this generation of GPU has two hardware queues that can operate ...
10
votes
0answers
152 views
Choosing width of data for signed distance field texture
A signed distance field texture is a technique where you store the distance from a pixel to the surface of a shape within the color information for that pixel, allowing almost vector graphics quality ...
10
votes
0answers
349 views
Problem with definition of BSDF and radiance
When I was reading theory behind physical based rendering I noticed that definition of BSDF and radiance has some problems. For example BSDF of purely specular surfaces is zero almost everywhere and ...
9
votes
0answers
178 views
Why does increasing simplex noise dimension wash it out?
I just tried using this approach to create a tiling 2d simplex noise function with Gustavson's java implementation. The result tiled, but the texture seemed muddy / washed out.
I decided to compare ...
9
votes
0answers
137 views
Find the longest straight line between two points on surface of polygon
My shape is a slightly concave polygon, and I'd like to know the maximal diameter. I imagine a straight line between two points on the surface of the polygon, such that the line does not pass outside ...
9
votes
0answers
102 views
How to describe the bi-directional links for the Weiler-Atherton algorithm?
My postscript interpreter currently implements the Hodgeman-Sutherland clipping algorithm but this is limited to simpler shapes and doesn't have a provision for utilizing various winding-number rules. ...
9
votes
1answer
163 views
The most performant way to organize vertex data on modern GPUs
Say I have a model made up of vertices, each with position, normal, tangent, and ...
8
votes
0answers
238 views
Using Monte carlo on Rayleigh scattering
Update
I am editing and posting this question in a different way; this time from the point of view of Nishita paper.
Sunlight gets scattered at P and attenuated before reaching Pv. Therefore ...
8
votes
0answers
87 views
Help with start up bias in Metropolis Light Transport
I'm trying to implement metropolis light transport based on this paper, and I have the basic thing working. I run the algorithm multiple times with different starting points, add the results for each ...
8
votes
0answers
188 views
WebGL packing/unpacking functions that can roundtrip all typical 32-bit floats
I have a WebGL circuit simulator. One of the problems it has is that, due to using quite a lot of intermediate float textures as it simulates, it doesn't work on various mobile devices. They only ...
8
votes
0answers
116 views
Conserving Mass in Liquid Simulation
I am trying to implement a 2D version of Foster and Fedkiw's paper, "Practical Animation of Liquids" here: http://physbam.stanford.edu/~fedkiw/papers/stanford2001-02.pdf
Mostly everything works, ...
8
votes
0answers
317 views
3D mesh segmentation simple algorithm
I am developing the algorithm reported in this article:
Least square conformal mapping.
Here is presented an algorithm to flat a 3d mesh on the parametric space, but i don't understand the ...
8
votes
0answers
326 views
How correct is rendering in XYZ / linear RGB space?
I have a spectral power distribution (SPD, 5 nm steps) for all light sources in the scene and SPDs for the reflectance of all surfaces under any light / viewer angle in question.
I'm going to ...
