RenderEngine(bpy_struct)

Simple Render Engine

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

base class — bpy_struct

subclasses — CYCLES

class bpy.types.RenderEngine(bpy_struct)

Render engine

bl_idname
Type:string, default “”, (never None)
bl_label
Type:string, default “”, (never None)
bl_use_exclude_layers
Type:boolean, default False
bl_use_postprocess
Type:boolean, default False
bl_use_preview
Type:boolean, default False
bl_use_save_buffers
Type:boolean, default False
bl_use_shading_nodes
Type:boolean, default False
bl_use_texture_preview
Type:boolean, default False
camera_override
Type:Object, (readonly)
is_animation
Type:boolean, default False
is_preview
Type:boolean, default False
layer_override
Type:boolean array of 20 items, default (False, False, False, False, False, False, False, False, False, False, False, False, False, False, False, False, False, False, False, False)
render
Type:RenderSettings, (readonly)
resolution_x
Type:int in [-inf, inf], default 0, (readonly)
resolution_y
Type:int in [-inf, inf], default 0, (readonly)
tile_x
Type:int in [0, inf], default 0
tile_y
Type:int in [0, inf], default 0
use_highlight_tiles
Type:boolean, default False
update(data=None, scene=None)

Export scene data for render

render(scene=None)

Render scene into an image

bake(scene, object, pass_type, pixel_array, num_pixels, depth, result)

Bake passes

Parameters:
  • pass_type (enum in [‘COMBINED’, ‘Z’, ‘COLOR’, ‘DIFFUSE’, ‘SPECULAR’, ‘SHADOW’, ‘AO’, ‘REFLECTION’, ‘NORMAL’, ‘VECTOR’, ‘REFRACTION’, ‘OBJECT_INDEX’, ‘UV’, ‘MIST’, ‘EMIT’, ‘ENVIRONMENT’, ‘MATERIAL_INDEX’, ‘DIFFUSE_DIRECT’, ‘DIFFUSE_INDIRECT’, ‘DIFFUSE_COLOR’, ‘GLOSSY_DIRECT’, ‘GLOSSY_INDIRECT’, ‘GLOSSY_COLOR’, ‘TRANSMISSION_DIRECT’, ‘TRANSMISSION_INDIRECT’, ‘TRANSMISSION_COLOR’, ‘SUBSURFACE_DIRECT’, ‘SUBSURFACE_INDIRECT’, ‘SUBSURFACE_COLOR’]) – Pass, Pass to bake
  • num_pixels (int in [0, inf]) – Number of Pixels, Size of the baking batch
  • depth (int in [0, inf]) – Pixels depth, Number of channels
view_update(context=None)

Update on data changes for viewport render

view_draw(context=None)

Draw viewport render

update_script_node(node=None)

Compile shader script node

tag_redraw()

Request redraw for viewport rendering

tag_update()

Request update call for viewport rendering

begin_result(x, y, w, h, layer="")

Create render result to write linear floating point render layers and passes

Parameters:
  • x (int in [0, inf]) – X
  • y (int in [0, inf]) – Y
  • w (int in [0, inf]) – Width
  • h (int in [0, inf]) – Height
  • layer (string, (optional, never None)) – Layer, Single layer to get render result for
Returns:

Result
Return type:

RenderResult
update_result(result)

Signal that pixels have been updated and can be redrawn in the user interface

Parameters:result (RenderResult) – Result
end_result(result, cancel=False, do_merge_results=False)

All pixels in the render result have been set and are final

Parameters:
  • result (RenderResult) – Result
  • cancel (boolean, (optional)) – Cancel, Don’t mark tile as done, don’t merge results unless forced
  • do_merge_results (boolean, (optional)) – Merge Results, Merge results even if cancel=true
test_break()

Test if the render operation should been canceled, this is a fast call that should be used regularly for responsiveness

Returns:Break
Return type:boolean
update_stats(stats, info)

Update and signal to redraw render status text

Parameters:
  • stats (string, (never None)) – Stats
  • info (string, (never None)) – Info
frame_set(frame, subframe)

Evaluate scene at a different frame (for motion blur)

Parameters:
  • frame (int in [-inf, inf]) – Frame
  • subframe (float in [0, 1]) – Subframe
update_progress(progress)

Update progress percentage of render

Parameters:progress (float in [0, 1]) – Percentage of render that’s done
update_memory_stats(memory_used=0.0, memory_peak=0.0)

Update memory usage statistics

Parameters:
  • memory_used (float in [0, inf], (optional)) – Current memory usage in megabytes
  • memory_peak (float in [0, inf], (optional)) – Peak memory usage in megabytes
report(type, message)

Report info, warning or error messages

Parameters:
  • type (enum set in {‘DEBUG’, ‘INFO’, ‘OPERATOR’, ‘PROPERTY’, ‘WARNING’, ‘ERROR’, ‘ERROR_INVALID_INPUT’, ‘ERROR_INVALID_CONTEXT’, ‘ERROR_OUT_OF_MEMORY’}) – Type
  • message (string, (never None)) – Report Message
error_set(message)

Set error message displaying after the render is finished

Parameters:message (string, (never None)) – Report Message
bind_display_space_shader(scene)

Bind GLSL fragment shader that converts linear colors to display space colors using scene color management settings

unbind_display_space_shader()

Unbind GLSL display space shader, must always be called after binding the shader

support_display_space_shader(scene)

Test if GLSL display space shader is supported for the combination of graphics card and scene settings

Returns:Supported
Return type:boolean

Inherited Properties

Inherited Functions