text: import bpy
  
  class CrayRenderEngine(bpy.types.RenderEngine):
      bl_idname = "C-ray"
      bl_label = "C-ray path tracing integration"
      bl_use_preview = False
      
      def render(self, scene):
          scale = scene.render.resolution_percentage / 100.0
          self.size_x = int(scene.render.resolution_x * scale)
          self.size_y = int(scene.render.resolution_y * scale)
          self.render_scene(scene)
          
      def render_scene(self, scene):
          pixel_count = self.size_x * self.size_y
          blueRect = [[0.0, 0.0, 1.0, 1.0]] * pixel_count
          result = self.begin_result(0, 0, self.size_x, self.size_y)
          layer = result.layers[0].passes["Combined"]
          layer.rect = blueRect
          self.end_result(result)
  
  def register():
      bpy.utils.register_class(CrayRenderEngine)
      
      from bl_ui import (
              properties_render,
              properties_material,
              )
      properties_render.RENDER_PT_render.COMPAT_ENGINES.add(CrayRenderEngine.bl_idname)
      properties_material.MATERIAL_PT_preview.COMPAT_ENGINES.add(CrayRenderEngine.bl_idname)
      
  def unregister():
      bpy.utils.unregister_class(CrayRenderEngine)
      
      from bl_ui import (
              properties_render,
              properties_material,
              )
      properties_render.RENDER_PT_render.COMPAT_ENGINES.remove(CrayRenderEngine.bl_idname)
      properties_material.MATERIAL_PT_preview.COMPAT_ENGINES.remove(CrayRenderEngine.bl_idname)
      
  if __name__ == "__main__":
      register()