vertex deformation shaders are a vicious linear algebra skill check

how much rust do you have to write before you’re compelled to describe every project as blazing fast 🔥🚀

blender 4.5 nodes to create a truss. it samples a pair of curves and connects corresponding sample points with a cylinder. #blender3d

i think ray marching on a deformed surface is completely ironed out now! specular is pointing the right way, it doesn't fall apart with extreme deformations, and i can chain together several deformations. #unity3d #simulation

generalized norm mapping c:

i finally got this ~working: ray marching on a deformed surface. ray marching requires a euclidean distance metric to converge quickly. the idea here is to deform the surface (ro) and the incident vector (rd) using the deformation's jacobian. the march then runs in a locally linear space. #unity3d

using nvidia's slang language + compiler to automatically differentiate a vertex deformation shader. this lets me completely skip the process of manually computing the jacobian of a vertex deformation. analytic normals without any of the legwork! #Unity3D

I ported my water spectrum code to C# and made an automated build script. Spectrum generation, FFT pipeline setup, and hooking into the surface shader is all automated now. The number of cascades, their scale, and all physical parameters are now configured in one panel. #unity3d #simulation

I added physically accurate viscosity term to my water sim. Cold ocean water typically has a viscosity around ~0.077-0.079 N/m. This video shows 0 N/m, 1 N/m, then 50 N/m. #Unity3d #simulation

NSFW/WIP. I'm really pleased with how the topology turned out on this asset I'm working on. I drew the seams with the grease pencil, then made a topology around them. Making all the structures for a base to deform well, while also adhering to the seam design, is a fun challenge.

hand retopology study :) I'm getting a little better at the islanding workflow. the goals were to have nice edge flow around seams, holding edges on all major features, and 100% quads. two 6-poles snuck in, unfortunately.

messing with hypotrochoids again :) multiplying radius by theta gives interesting results #Unity3d

Cloth! I added a cloth lobe using Estevez et. al. "Production Friendly Microfacet Sheen BRDF." I also wrote a little monte carlo integrator to bake energy compensation textures for image-based lighting. #Unity3d

i added clearcoat to my brdf today! #Unity3d

more work on the fft water :) - 4 cascades - sea foam - view dependent subsurface scattering approximation - distance based tessellation and proper culling - new purpose-built brdf ~1.5ms on the gpu. #unity3d #vrchat

fft water wip :) all heavy lifting is done on the GPU. I'll chase down bugs with the normals before adding cascades and water-specific lighting effects. #unity3d #vrchat