Questions tagged [ibl]

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1 answer

White spots when rendering diffuse material with environment light

I am trying to implement a simple shader. A round ball object is rendered with uniform albedo and I noticed some strange white spots on the outputs. I perform importance sampling with 512 light ...
Ivan's user avatar
  • 121
1 vote
0 answers

replace IBL with single color - the lighting equation

I want to avoid IBL (image based lighting), however my scenes are way too dark - especially close-to-mirror like surfaces, which get little contributions from other direct light sources in the scene. ...
Tomas's user avatar
  • 41
1 vote
1 answer

Integrating BRDF using Importance Sampling

I read some articles about BRDF integration with and without importance sampling and I don't understand one thing in equations. If we integrate a BRDF over hemisphere with uniform sample direction ...
Emil Kabirov's user avatar
1 vote
0 answers

Contour-line looking artifact on diffuse irradiance map

I tried implementing my own diffuse irradiance map maker after reading Learn OpenGL > PBR > IBL > Diffuse Irradiance. It takes an HDR image and makes six HDR cube map. But It keeps making ...
Ingun전인건's user avatar
2 votes
3 answers

PBR : Understanding the right part of Split sum integration of specular IBL

This is the website I am learning from. In the specular part of IBL this is the split sum approximation Now the left part of the equation I have asked in This post and I have understood everything ...
Sync it's user avatar
  • 169
3 votes
0 answers

Comparing different sampling methods for GGX IBL

I have made a demo that shades a sphere with an environment map. I wanted to compare 3 different ways of sampling the environment. Uniform sampling. Importance sampling with the NDF as suggested in ...
user1754322's user avatar
0 votes
1 answer

Problem sampling uniformly envmap with GGX

I have made a program that samples uniformly an environment map and computes the lighting using the GGX BRDF. I have made a small example that reproduces the issue I'm having. You can check it out ...
user1754322's user avatar
0 votes
1 answer

How Image Based Lighting is applied to indoor scene?

Now the mainstream engine's approach is to use image-based lighting to achieve approximate global illumination, but such a technique seems to be only applicable to outdoor scenes.What kind of ...
jacksparowll's user avatar
0 votes
1 answer

Weirdly looking diffuse irradiance map

I have problem with creating diffuse irradiance map. As reference I am using and
DirectX_Programmer's user avatar
16 votes
3 answers

Importance Sampling of Environment Maps

What is the best currently known and ideally also production-verified approach for sampling environment maps (EM) in a MIS-based uni-directional path tracer and similar types of renderers? I would ...
ivokabel's user avatar
  • 1,444
6 votes
1 answer

Image based lighting, tangent space coordinates, and optimization

When I saw an implementation of normal mapping that computed the TBN matrix in the vertex shader and converted everything (in particular the view vector and light vector) to tangent space at that ...
Julien Guertault's user avatar