fix z fighting

Author: Licini

src/compas_viewer/renderer/renderer.py

@@ -201,7 +201,6 @@ def initializeGL(self):
         """
         GL.glClearColor(*self.viewer.config.renderer.backgroundcolor.rgba)
         GL.glPolygonOffset(1.0, 1.0)
-        GL.glEnable(GL.GL_POLYGON_OFFSET_FILL)
         GL.glEnable(GL.GL_CULL_FACE)
         GL.glCullFace(GL.GL_BACK)
         GL.glEnable(GL.GL_DEPTH_TEST)

src/compas_viewer/scene/buffermanager.py

@@ -207,6 +207,7 @@ def draw(self, shader: Shader, line_shader: Shader, rendermode: str, is_instance
 
         # Frist Draw all the opaque elements
         # Draw faces
+        GL.glEnable(GL.GL_POLYGON_OFFSET_FILL)
         if not is_wireframe and (not is_ghosted or is_instance):
             shader.uniform1i("is_lighted", is_lighted)
             shader.uniform1i("element_type", 2)
@@ -219,6 +220,7 @@ def draw(self, shader: Shader, line_shader: Shader, rendermode: str, is_instance
                     if is_instance:
                         # Also include transparent elements when rendering instance map
                         shader.draw_triangles(elements=self.buffer_ids[face_type]["elements_transparent"], n=len(self.elements[face_type + "_transparent"]))
+        GL.glDisable(GL.GL_POLYGON_OFFSET_FILL)
 
         # Draw points
         shader.uniform1i("element_type", 0)