walk around reorienting world torus

src/scenes/shader/tile_frag.glsl

@@ -10,9 +10,9 @@ uniform b_constants {
   uvec4 anim;
   float R1;
   float R2;
+  float R3;
 };
 uniform b_locals {
-  mat4 camera;
   uint millis;
   float treadmill_x;
   float treadmill_y;