Some question about tune shaders?

[lishi0927]

Hello.
Recently, I directly run your sine_quadric shader with adaptive gaussian, but I get awful results. I think it may be caused by specular function, pow(x, 25);

How do you tune this shader to get the result shown in your paper?

[yyuting]

Hello,
The tuner should output a series of program variants that are on the Pareto frontier. The result you are showing looks like a variant that optimize runtime rather than error. Did you check other variants on the Pareto frontier with a smaller error?
For the shader in Fig 5, the following command is used to tune that shader:

python tune_shader.py full out_dir render_sin_quadratic plane ripples

Depending on your machines, you may also want to set a larget value for --time_limit to avoid variants failing because of reaching the time limit (default is 480).

Hope this helps.