From 3dcb2fd0e240f3c0141e65c32bc2c4a7f8e9fd20 Mon Sep 17 00:00:00 2001
From: yum <yum.food.vr@gmail.com>
Date: Sat, 13 Jul 2024 16:33:25 -0700
Subject: Integration pixellation and trochoid shaders

Trochoid is a WIP. Need to do some magic to make it properly shear. In
short: it's currently implemented as a standalone Mesh Renderer object
which I place on my avatar's neck bone. Since its object origin is not
at the hip bone like everything else, it behaves weirdly when shearing.

Solution is to implement it as a regular skinned mesh renderer. Requires
some careful analysis to get right.
---
 shear_math.cginc | 60 ++++++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 60 insertions(+)
 create mode 100644 shear_math.cginc

(limited to 'shear_math.cginc')

diff --git a/shear_math.cginc b/shear_math.cginc
new file mode 100644
index 0000000..a2eded2
--- /dev/null
+++ b/shear_math.cginc
@@ -0,0 +1,60 @@
+#ifndef __SHEAR_MATH_INC
+#define __SHEAR_MATH_INC
+
+#if defined(_GIMMICK_SHEAR_LOCATION)
+
+void getMeshRendererMatrices(bool invert, out float3x3 rot_fix,
+    out float4x4 ts_fix) {
+  if (_Gimmick_Shear_Location_Mesh_Renderer_Fix) {
+    float3 theta = float3(
+        _Gimmick_Shear_Location_Mesh_Renderer_Rotation.x,
+        _Gimmick_Shear_Location_Mesh_Renderer_Rotation.y,
+        _Gimmick_Shear_Location_Mesh_Renderer_Rotation.z);
+    theta = invert ? -theta : theta;
+    float3x3 rotate_x = float3x3(
+        1, 0, 0,
+        0, cos(theta.x), -sin(theta.x),
+        0, sin(theta.x), cos(theta.x));
+    float3x3 rotate_y = float3x3(
+        cos(theta.y), 0, sin(theta.y),
+        0, 1, 0,
+        -sin(theta.y), 0, cos(theta.y));
+    float3x3 rotate_z = float3x3(
+        cos(theta.z), -sin(theta.z), 0,
+        sin(theta.z), cos(theta.z), 0,
+        0, 0, 1);
+    rot_fix = invert ?
+      mul(rotate_x, mul(rotate_y, rotate_z)) :
+      mul(rotate_z, mul(rotate_y, rotate_x));
+    float3 scale = float3(
+        _Gimmick_Shear_Location_Mesh_Renderer_Scale.x,
+        _Gimmick_Shear_Location_Mesh_Renderer_Scale.y,
+        _Gimmick_Shear_Location_Mesh_Renderer_Scale.z);
+    scale = invert ? 1 / scale : scale;
+    float3 offset = float3(
+        _Gimmick_Shear_Location_Mesh_Renderer_Offset.x,
+        _Gimmick_Shear_Location_Mesh_Renderer_Offset.y,
+        _Gimmick_Shear_Location_Mesh_Renderer_Offset.z);
+    offset = invert ? -offset : offset;
+    ts_fix = float4x4(
+        scale.x, 0, 0, offset.x,
+        0, scale.y, 0, offset.y,
+        0, 0, scale.z, offset.z,
+        0, 0, 0, 1);
+  } else {
+    rot_fix = float3x3(
+        1, 0, 0,
+        0, 1, 0,
+        0, 0, 1);
+    ts_fix = float4x4(
+        1, 0, 0, 0,
+        0, 1, 0, 0,
+        0, 0, 1, 0,
+        0, 0, 0, 1);
+  }
+}
+
+#endif  // _GIMMICK_SHEAR_LOCATION
+
+#endif  // __SHEAR_MATH_INC
+
-- 
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