import bpy
class CustomRenderEngine(bpy.types.RenderEngine):
# These three members are used by blender to set up the
# RenderEngine; define its internal name, visible name and capabilities.
bl_idname = 'custom_renderer'
bl_label = 'Flat Color Renderer'
bl_use_preview = True
# This is the only method called by blender, in this example
# we use it to detect preview rendering and call the implementation
# in another method.
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)
if scene.name == 'preview':
self.render_preview(scene)
else:
self.render_scene(scene)
# In this example, we fill the preview renders with a flat green color.
def render_preview(self, scene):
pixel_count = self.size_x * self.size_y
# The framebuffer is defined as a list of pixels, each pixel
# itself being a list of R,G,B,A values
green_rect = [[0.0, 1.0, 0.0, 1.0]] * pixel_count
# Here we write the pixel values to the RenderResult
result = self.begin_result(0, 0, self.size_x, self.size_y)
layer = result.layers[0]
layer.rect = green_rect
self.end_result(result)
# In this example, we fill the full renders with a flat blue color.
def render_scene(self, scene):
pixel_count = self.size_x * self.size_y
# The framebuffer is defined as a list of pixels, each pixel
# itself being a list of R,G,B,A values
blue_rect = [[0.0, 0.0, 1.0, 1.0]] * pixel_count
# Here we write the pixel values to the RenderResult
result = self.begin_result(0, 0, self.size_x, self.size_y)
layer = result.layers[0]
layer.rect = blue_rect
self.end_result(result)
# Register the RenderEngine
bpy.utils.register_class(CustomRenderEngine)
# RenderEngines also need to tell UI Panels that they are compatible
# Otherwise most of the UI will be empty when the engine is selected.
# In this example, we need to see the main render image button and
# the material preview panel.
from bl_ui import properties_render
properties_render.RENDER_PT_render.COMPAT_ENGINES.add('custom_renderer')
del properties_render
from bl_ui import properties_material
properties_material.MATERIAL_PT_preview.COMPAT_ENGINES.add('custom_renderer')
del properties_material