Try to fix the lighting

frontend/src/shaders/passthrough-shading-vs.glsl

@@ -3,8 +3,10 @@
 uniform mat3 ndcToWorld;
 in vec4 a_position;
 out vec2 worldCoordinates;
+out vec2 uvCoordinates;
 
 void main() {
     worldCoordinates = (vec3(a_position.xy, 1.0) * ndcToWorld).xy;
+    uvCoordinates = ((a_position.xy + vec2(1.0)) / 2.0).xy;
     gl_Position = a_position;
 }