TouchDesigner Vertex Shaders 02 – Kalaidescopic Layers

We continue our exploration of vertex shaders in TouchDesigner in this video, writing a custom Vertex and Fragment shader for a GLSL material that will allow us to create and composite layers of a texture to generate kalaidescopic visuals.

I have included the boilerplate code for the GLSL rotation matrix below in the description, as well as on my patreon.

Project files with postprocessing: www.patreon.com/water__shed

00:00 – Start
00:23 – Overview and Motivation
01:38 – Render Setup
05:31 – Shader Setup
10:01 – Vertex Shader
17:26 – Fragment Shader
23:44 – Scaling UV Coordinates with Texture SOP

SHADER PREPROCESS DIRECTIVE CODE
_____

#define TWO_PI (PI*2.0)
#define deg2rad (PI/180.0)

mat4 rotMatXYZ(float xRot, float yRot, float zRot) {
float a = xRot*deg2rad;
float b = yRot*deg2rad;
float g = zRot*deg2rad;

return mat4(
cos(b)*cos(g), cos(g)*sin(a)*sin(b)-cos(a)*sin(g), cos(a)*cos(g)*sin(b)+sin(a)*sin(g), 0.,
cos(b)*sin(g), cos(a)*cos(g)+sin(a)*sin(b)*sin(g), -cos(g)*sin(a)+cos(a)*sin(b)*sin(g), 0.,
-sin(b), cos(b)*sin(a), cos(a)*cos(b), 0.,
0., 0., 0., 1.
);
}