fix: uvs for pass Geometry were not in texture space

src/lib/geometry/primitives/passGeometry.ts

@@ -12,14 +12,21 @@ import { Geometry } from "../Geometry";
 /**
  * A 2D pass geometry
  *
- * @param min homogeneous coordinate minimum
- * @param max homogeneous coordinate minimum
+ * @param min in clip space
+ * @param max in clip space
  */
 export function passGeometry(min = new Vector2(-1, -1), max = new Vector2(1, 1)): Geometry {
   const geometry = new Geometry();
   geometry.indices = makeUint32Attribute([0, 1, 2, 0, 2, 3]);
+
+  // in clip space: starts at bottom left, goes CW to top left, top right, bottom right.
   geometry.attributes["position"] = makeFloat32Attribute([min.x, min.y, min.x, max.y, max.x, max.y, max.x, min.y], 2);
-  geometry.attributes["uv"] = makeFloat32Attribute([0, 0, 0, 1, 1, 1, 1, 0], 2);
+
+  // texture space is not the same as clip space.  Thus this goes to the same locations but it has different
+  // values
+  geometry.attributes["uv"] = makeFloat32Attribute([1, 0, 0, 0, 0, 1, 1, 1], 2);
+
+  // because -z points forward, the normals for this to point towards would have to be +z.
   geometry.attributes["normal"] = makeFloat32Attribute([0, 0, 1, 0, 0, 1, 0, 0, 1, 0, 0, 1], 3);
 
   return geometry;