Recently, one of the responses to the Reconstruction Positions […] post dealt with the unprojection of frustum corners. More specifically: with the inverted projection matrix and the final division with the coordinate. Being the lazy sod that I am on Sundays, I thought I’d quickly google it and paste a link with the explanation. Only one problem:…
Okay, I’ll state this up front: I’m probably not going to use this approach in my own engine because of many issues inherent with Variance Shadow Mapping. However, I think I did end up with some interesting results to play with, so if VSM with fixed penumbra sizes (or just for filtering) is working well…
Introduction It’s been a while since last time, when I promised a general method for depth reconstruction regardless of projection type. I had told myself to do it “soon”. Due to lack of time partly caused by moving to Ghent and other random occurrences “soon” changed into “sooner or later” and finally we’ve arrived at…
Introduction [edit] To start things off more easily, I decided to limit this post to perspective projections and move on to the generalization (including orthographic projections) in a next blog post. When doing deferred shading or some post-processing effects, we’ll need the 3D position of the pixel we’re currently shading at some point. Rather than…
Introduction Image-space horizon-based ambient occlusion [HBAO] is a technique introduced by NVidia (Louis Bavoil et al.) in 2008. I recommend checking out the following resources to find out exactly how the algorithm works, this post will build on it further: ShaderX7 – Image-Space Horizon-Based Ambient Occlusion (by Louis Bavoil & Miguel Sainz) The original Siggraph…