Fix selection on clipping plane

Author: mhochsteger

ngsolve_webgpu/clipping.py

@@ -45,6 +45,7 @@ def get_shader_code(self):
 
 class ClippingCF(Renderer):
     compute_shader = "ngsolve/clipping/compute.wgsl"
+    select_entry_point = "fragment_select_no_clipping"
     n_vertices = 3
     subdivision = 0
 

ngsolve_webgpu/shaders/geo_vertex.wgsl

@@ -69,5 +69,5 @@ fn fragmentQueryIndex(input: GeoVertexInput) -> @location(0) vec4<u32> {
   if(length(input.pos.xy - input.pos2.xy) > u_vertex_thickness/2.) {
     discard;
   }
-  return vec4<u32>(@RENDER_OBJECT_ID@, bitcast<u32>(input.position.z/input.position.w), 0u, 0);
+  return vec4<u32>(@RENDER_OBJECT_ID@, bitcast<u32>(input.position.z), 0u, 0);
 }