Search found 62 matches

by shocker_0x15
Sun Nov 19, 2017 11:49 am
Forum: General Development
Topic: Weighted delta tracking question
Replies: 1
Views: 161

Re: Weighted delta tracking question

Hi, In my understanding, T_r / p_surf becomes the weight computed by cumulatively multiplying the following single step weight: single_step_weight.png as in the SD tracking paper. If this is implemented by following PBRT's interface for example for GridDensityMedium::Sample(), it returns the above w...
by shocker_0x15
Thu Jun 15, 2017 5:46 am
Forum: Visuals
Topic: My First Spectral rendering
Replies: 5
Views: 1600

Re: My First Spectral rendering

Cool ;)

What is the material?
Do you implement Hero wavelength spectral sampling?
by shocker_0x15
Mon May 22, 2017 11:08 am
Forum: General Development
Topic: Multi-wavelength free path sampling using ratio tracking
Replies: 7
Views: 2526

Re: Multi-wavelength free path sampling using ratio tracking

Nice work! :D Maybe it's also necessary to also consider the compensation for passtrough rays that leave the volume. Right, of course it needs consideration for such rays as you say. It corresponds to my code at l.80 in the current implementation: https://github.com/shocker-0x15/SLR/blob/master/libS...
by shocker_0x15
Fri May 05, 2017 2:07 pm
Forum: General Development
Topic: Multi-wavelength free path sampling using ratio tracking
Replies: 7
Views: 2526

Re: Multi-wavelength free path sampling using ratio tracking

great!!! :o

I will read it immediately.

Thanks!
by shocker_0x15
Wed Feb 22, 2017 5:15 am
Forum: General Development
Topic: Multi-wavelength free path sampling using ratio tracking
Replies: 7
Views: 2526

Multi-wavelength free path sampling using ratio tracking

Hi, I'm curious about whether using ratio tracking for estimating Monte Carlo constribution (f(x) / p(x), not transmittance) with delta tracking for heterogeneous media is unbiased. We can get a MC contribution of free path sampling by delta tracking for a wavelength used for the procedure. There is...
by shocker_0x15
Mon Jan 09, 2017 5:15 pm
Forum: General Development
Topic: Volumetric Pathtracing / Small UPBP
Replies: 4
Views: 9526

Re: Volumetric Pathtracing / Small UPBP

Sorry to be late. This procedure implicitly includes selection between the two terms with probability. select the case 1 with probability P_s select the case 2 with probability 1 - P_s P_s is a probability to perform evaluation on surface. case 1: immediately evaluate the attenuated radiance leaving...
by shocker_0x15
Thu Dec 15, 2016 1:55 am
Forum: General Development
Topic: Volumetric Pathtracing / Small UPBP
Replies: 4
Views: 9526

Re: Volumetric Pathtracing / Small UPBP

Hi, As you know, volume light transport equation consists of two terms where the one is attenuated light L_s leaving a surface and the other is "the integral of" light gain L_a due to in-scattering and emission. L_i = T * L_s + int T * L_a ds * L_a is volumetric emission and in-scattering ...
by shocker_0x15
Mon Dec 12, 2016 2:16 am
Forum: General Development
Topic: Multiple Textures CUDA/OpenCL
Replies: 8
Views: 9582

Re: Multiple Textures CUDA/OpenCL

Thank you ultimatemau.
It is exactly what I want to say.
by shocker_0x15
Thu Dec 08, 2016 1:44 am
Forum: General Development
Topic: Multiple Textures CUDA/OpenCL
Replies: 8
Views: 9582

Re: Multiple Textures CUDA/OpenCL

Hi, If we create a global illumination renderer like path tracing, using a dedicated texture type seems not plausible because we cannot know which texture is used and a lot of textures should be bound into kernel. In my OpenCL renderer, I used a single uchar* argument of a kernel as a pointer to tex...
by shocker_0x15
Fri Aug 12, 2016 7:54 am
Forum: General Development
Topic: Ideal Specular BTDF
Replies: 2
Views: 4008

Re: Ideal Specular BTDF

Thanks sriravic and sorry to be late :) I can understand why the ideal specular BRDF/BTDF should have the cosine dividing. BRDF has reciprocity, so it has the same value if it takes swapped directions: f_r(w_i, w_o) = f_r(w_o, w_i) It is easy to confirm the ideal specular BRDF obey this relation. BT...

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