You thought those ternary operator were going to be converted to conditional move? Sorry... Introduction It is a normal day, having some fun optimizing a custom CPU implementation of Tero Kerras BVH , with the Superluminal profiler , (super cool by the way, check it out) , when the profiler itself tells you the in the ray traversal function, one piece of code is particularly expensive, I started to drill down to find some interesting surprises. Read more ...

TL;DR: How to generate a stable orientation along a curve, math and Unity implementation. Here the repository with all the code and Unity project. Introduction Parallel transport is a technique that allows computing a moving frame (a 4x4 matrix defining a coordinate system) down the curve. Here is an example: The computation starts on the top right of the image, where the gizmo is, then move sequentially down the curve. Read more ...

Introduction In today’s blog post I would like to talk about hair simulation, it has been something that always piqued my interest. I attempted to do a proper simulation in the past based on the Position based dynamics , more specifically the one focusing on inextensible hair strand . The issue with both papers was that they did not worry about keeping the initial hair shape, basically the groom an artist would have spent days crafting. Read more ...