Several cross products and a few dot products later, I have what appears to be a proper camera space coordinates setup for rendering #matcap textures. If the stakes are about as low as the computing power, I might still use the magic number approach for realtime implementations for reduced calculation load. π
Blender file can be downloaded here: https://github.com/jeinselen/Blender-NodeKit/blob/main/Launch_NodeKit/MatNodes-Matcap.blend
Technical art support question! How do you calculate #matcap mapping?
I used a cross product of the surface normal and view vector on a Unity project a few years ago, and it works in #Blenderβ¦but the perspective distortion ends up cropping some of the edges. I hacked together a slightly improved version that uses magic numbers and the Z component, but that can't be correct. π
Attached images: matcap source, #blender3d material nodes setup (with hacky fix selected), and render.
RTβKsenia Kondrashova
#genuary16 as an excuse to publish this one
Cheap way to turn @threejs primitive to disco ball
- instanced planes w/ matcap material
- positions & normals taken from original geometry merged vertices
Hosted on @CodePen
#genuary #threejs #matcap #codepen
https://codepen.io/ksenia-k/pen/ZEjJxWQ
Using MATCAP
https://youtu.be/G0ZIeusnZWk
A #vvvv tutorial by Takuma Nakata
#visualprogramming #creativecoding #matcap
John Einselen
eobet
Aiekick
madame_etrange
CodePen.IO 
vvvv - a multipurpose toolkit