Modify the shader to show the right color

Use the common MeshData instead of trimesh.

cura/PickingPass.py

@@ -4,6 +4,9 @@
 import random
 from typing import Optional, TYPE_CHECKING
 
+from PyQt5.QtCore import QBuffer
+
+from UM.Mesh.MeshBuilder import MeshBuilder
 from UM.Qt.QtApplication import QtApplication
 from UM.Math.Vector import Vector
 from UM.Math.Color import Color
@@ -47,36 +50,45 @@ class PickingPass(RenderPass):
         # Fill up the batch with objects that can be sliced. `
         for node in DepthFirstIterator(self._scene.getRoot()): #type: ignore #Ignore type error because iter() should get called automatically by Python syntax.
             if node.callDecoration("isSliceable") and node.getMeshData() and node.isVisible():
-                tri_node = node.getMeshData().toTrimesh()
+                faces = node.getMeshData().getIndices()
-                for index, face in enumerate(tri_node.faces):
+                vertices = node.getMeshData().getVertices()
-                    normal_vertex = tri_node.face_normals[index]
+                normals = node.getMeshData().getNormals()
+                print("Faces:", faces)
+                print("Vertices", vertices)
+
+                for index, face in enumerate(faces):
+                    normal_vertex = normals[index]
+                    triangle_mesh = vertices[face]
+                    print(face, normal_vertex, triangle_mesh)
+
                     batch.addItem(transformation = node.getWorldTransformation(), mesh = node.getMeshData(), uniforms = { "selection_color": self._getFaceColor(face, normal_vertex)})
 
         self.bind()
         batch.render(self._scene.getActiveCamera())
         self.release()
 
-    def _getFaceColor(self, face, normal_vertex):
+    def _getFaceColor(self, face: Vector, normal_vertex: Vector) -> Color:
         while True:
             r = random.randint(0, 255)
             g = random.randint(0, 255)
             b = random.randint(0, 255)
-            a = 0
+            a = 255
             color = Color(r, g, b, a)
 
             if color not in self._selection_map:
                 break
 
-        self._selection_map[color] = normal_vertex
+        print("Adding color: {color} - {normal}".format(color = color, normal = normal_vertex))
-
+        self._selection_map[color] = {"face": id(face), "normal_vertex": normal_vertex}
         return color
 
     ##  Get the normal vector at a certain pixel coordinate.
-    def getPickedNormalVertex(self, x: int, y: int) -> float:
+    def getPickedNormalVertex(self, x: int, y: int) -> Optional[Vector]:
-
-        print(self._selection_map)
         output = self.getOutput()
 
+        print("Creating image")
+        output.save("thumbnail.png")
+
         window_size = self._renderer.getWindowSize()
 
         px = (0.5 + x / 2.0) * window_size[0]
@@ -87,7 +99,10 @@ class PickingPass(RenderPass):
 
         pixel = output.pixel(px, py)
         print("######### ", x, y, pixel, Color.fromARGB(pixel))
-        return self._selection_map.get(Color.fromARGB(pixel), None)
+        face = self._selection_map.get(Color.fromARGB(pixel), None)
+        if not face:
+            return None
+        return face.get("normal_vertex", None)
 
     ##  Get the distance in mm from the camera to at a certain pixel coordinate.
     def getPickedDepth(self, x: int, y: int) -> float:

resources/shaders/camera_distance.shader

@@ -17,6 +17,7 @@ vertex =
 
 fragment =
     uniform highp vec3 u_viewPosition;
+    uniform lowp vec4 u_color;
 
     varying highp vec3 v_vertex;
 
@@ -29,8 +30,9 @@ fragment =
         encoded.g = floor((distance_to_camera - encoded.r * 65536.0) / 256.0);
         encoded.b = floor(distance_to_camera - encoded.r * 65536.0 - encoded.g * 256.0);
 
-        gl_FragColor.rgb = encoded / 255.;
+        //gl_FragColor.rgb = encoded / 255.;
-        gl_FragColor.a = 1.0;
+        //gl_FragColor.a = 1.0;
+        gl_FragColor = u_color;
     }
 
 vertex41core =
@@ -53,6 +55,7 @@ vertex41core =
 fragment41core =
     #version 410
     uniform highp vec3 u_viewPosition;
+    uniform lowp vec4 u_color;
 
     in highp vec3 v_vertex;
 
@@ -67,8 +70,9 @@ fragment41core =
         encoded.g = floor((distance_to_camera - encoded.r * 65536.0) / 256.0);
         encoded.b = floor(distance_to_camera - encoded.r * 65536.0 - encoded.g * 256.0);
 
-        frag_color.rgb = encoded / 255.;
+        //frag_color.rgb = encoded / 255.;
-        frag_color.a = 1.0;
+        //frag_color.a = 1.0;
+        frag_color = u_color;
     }
 
 [defaults]
@@ -78,6 +82,7 @@ u_modelMatrix = model_matrix
 u_viewProjectionMatrix = view_projection_matrix
 u_normalMatrix = normal_matrix
 u_viewPosition = view_position
+u_color = selection_color
 
 [attributes]
 a_vertex = vertex