Blender Python addon for a separate Render Test settings panel

bpy_TestRender_UI_only

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bl_info = {
    "name": "Render Test",
    "author": "JTa with help from FergusL & Intracube",
    "version": (0, 1),
    "blender": (2, 66, 0),
    "location": "Properties > Render > Render Test",
    "description": "This script, applies a temporary material to all objects"\
        " of the scene.",
    "wiki_url": "",
    "tracker_url": "", "category": ""}


# Render Test - rough draft 0.1.3a, UI only at this point...

import bpy
from bpy.props import *


#Setup Radio Button Enum Props
bpy.types.Scene.rtSizeEnum = bpy.props.EnumProperty( \
  items = [('Half', 'Half', 'Half the size of the render rez'),\
  ('Quarter', 'Quarter', 'Quarter the size of the render rez'),\
  ('Thumbnail', 'Thumbnail', 'Thumbnail size of the render rez')],\
  name = 'trSize', default = 'Quarter')


class RenderTestPanel(bpy.types.Panel):
    bl_label = "Render Test"
    bl_space_type = "PROPERTIES"
    bl_region_type = "WINDOW"
    bl_context = "render"
 
    def draw(self, context):
        layout = self.layout 
        scn = bpy.context.scene
        rd = scn.render

        # Size selection
        row = layout.row()
        row.label(text="Reduce resolution to:")
        row = layout.row(align=True)
        row.alignment = 'EXPAND'
        layout.row().prop(context.scene,'rtSizeEnum', expand=True)

        # draw ui, grab a copy of x/y rez and % then populate my adjusters via radio button setting
        # dynamically change then when radio button is pressed
        split = layout.split()
        col = split.column()
        sub = col.column(align=True)
        sub.label(text="Resolution:")
        sub.prop(rd, "resolution_x", text="X")
        sub.prop(rd, "resolution_y", text="Y")
        sub.prop(rd, "resolution_percentage", text="")

        # Segment range set, default all
        # grab default segment range and copy, allowing change for rt
        layout.label(text="Segment Range:")
        row = layout.row(align=True)
        row.prop(scn, "frame_start")
        row.prop(scn, "frame_end")

        # Call render
        row = layout.row()
        #row.operator( "render.render" )
        row.operator( "bpt.render_test_op" )
 
        #if context.scene.rtSizeEnum == 'Half':

class RenderTestOperator(bpy.types.Operator):
    bl_idname = "bpt.render_test_op"
    bl_label = "Render Test"
 
    def execute(self, context):
        self.report({'INFO'}, "Test Render initiated! ")
        print(context.scene.rtSizeEnum)

        # quick outline of new code to add
        # copy actual render settings including path, we may want to override this to a RAMdisk and eventually RAM/VSE
        # maybe setup for linux only and RAMdisks?
        # substute render test settings, add filename to output edit box
        # run render routine below
        # restore original settings, have a full proof incase of oopse or cancel
        # additional features to add after this, every 10th frame toggle, all|current layer selection

        #bpy.ops.render.view_show()

        # NOTE: set output path edit box with a filename other wise it will write .png as a hidden file
        #scn = bpy.context.window.screen.scene
        #bpy.ops.render.render(animation=False, write_still=True, layer="", scene=scn.name)
        #bpy.ops.render.view_show()
        # below works also all filled in...
        # this works w/o setting context, but you must put in a filename, otherwise the file is .png and hidden
        bpy.ops.render.render(animation=False, write_still=True, layer="", scene="")

        return {'FINISHED'}
 
def register():
    bpy.utils.register_class( RenderTestPanel )
    bpy.utils.register_class( RenderTestOperator )
 
def unregister():
    bpy.utils.register_class( RenderTestPanel )
    bpy.utils.register_class( RenderTestOperator )
 
if __name__ == "__main__":
    register()

Ferg made me do it!