Questions tagged [global-illumination]
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71 questions
1 vote
1 answer
239 views
How to make ambient light look good (without Global Illumination)?
I recently added Voxel Cone Tracing Global Illumination into my game engine and everything works great. But I need somehow improve my plain ambient lighting without VXGI. Are there any techniques? I ...
- 23
1 vote
1 answer
359 views
Can anyone summarize in simple terms, how PSSMLT/MLT algorithms work?
I understand backwards path tracing and bidirectional path tracing (BDPT). However I'm failing to understand how Metrpolis Light Transport methods are even remotely feasible to run. My understanding ...
- 319
1 vote
0 answers
182 views
Directly Sampling an Area Light
So in my path tracer I sample both some bounce ray given an importance function for the current BRDF, and if applicable (reflection is non-specular) I directly sample all light sources (for my ...
- 319
2 votes
2 answers
341 views
Adding cos(θ) from rendering equation ruins the renderings
I'm following Ray Tracing The Rest of Your Life to implement a ray tracer, but the explains on math (mainly pdf part) got me confused so I followed Rendering Equation to understand the math behind. As ...
- 203
1 vote
1 answer
272 views
Specular reflection with different viewing direction where reflection direction and viewing direction coincide
Suppose $P_1$ and $P_2$ two different points on surface. And let $l$: be the light source direction, $n$: normal vector $r$: specular reflection direction $v$: viewing direction . In case 1 (at $P_1$...
- 212
0 votes
1 answer
248 views
State of the art in real-time global illumination algorithms [closed]
What is the state of the art in global illumination algorithms in real time applications? Which algorithms or categories of algorithms are actually used in the wild and what are their characteristics (...
- 155
1 vote
1 answer
159 views
How to count the photons when Photon Mapping
I wrote a rather elegant and compact Photon Mapper in CUDA. But I treat all my photons they same, and ignore their colour. This simplicity has some nice properties: e.g. I can just count them with one ...
- 280
0 votes
0 answers
89 views
How is the image reconstruction filter on the path space defined in terms of the filter on the raster space?
Say we have a image reconstruction filter $h:R\to\mathbb R$ defined on the raster space $[0,w]\times[0,h]$, where $w,h\in\mathbb N$ define the width and height of the image plane in pixels, ...
- 203