PythonistaでSCNMaterialのlightingModelを指定する

Pythonista では swift の struct や定数？にうまくアクセスできなくてモデルの質感を大きく変えられる SCNMaterial の lightingModel を変更できないと思っていたのですが、方法が見つかったのでご紹介します。

setLightingModelName_(string name)

lightingModel は SCNMaterial のプロパティですが、変更する時は setLightingModelName_ 関数を使います。

引数は文字列で下記の文字列が指定可能です。

class SCNLightingModel:
    blinn = 'SCNLightingModelBlinn'
    constant = 'SCNLightingModelConstant'
    lambert = 'SCNLightingModelLambert'
    phong = 'SCNLightingModelPhong'
    physicallyBased = 'SCNLightingModelPhysicallyBased'
    shadowOnly = 'SCNLightingModelShadowOnly'

サンプルソース

scenekit03.py

import objc_util
from objc_util import *
import ui

load_framework('SceneKit')

SCNView,SCNNode,SCNScene,SCNCamera,SCNLight,SCNBox,SCNMaterial = map(ObjCClass, ['SCNView','SCNNode','SCNScene','SCNCamera','SCNLight','SCNBox','SCNMaterial'])

class SCNLightingModel:
    blinn = 'SCNLightingModelBlinn'
    constant = 'SCNLightingModelConstant'
    lambert = 'SCNLightingModelLambert'
    phong = 'SCNLightingModelPhong'
    physicallyBased = 'SCNLightingModelPhysicallyBased'
    shadowOnly = 'SCNLightingModelShadowOnly'


def main():
    main_view = ui.View()
    main_view_objc = ObjCInstance(main_view)

    # View
    scene_view = SCNView.alloc().initWithFrame_options_(((0, 0),(400, 400)), None).autorelease()
    # UIView.autoresizingMask = flexibleWidth(2) | flexibleHeight(16)
    scene_view.setAutoresizingMask_(18)
    scene_view.setAllowsCameraControl_(True)

    scene = SCNScene.scene()
    node_root = scene.rootNode()

    # material
    material = SCNMaterial.material()
    material.setLightingModelName_(SCNLightingModel.physicallyBased) 
    material.diffuse().setColor_(UIColor.redColor().CGColor())

    # box geometry
    geom_box = SCNBox.boxWithWidth_height_length_chamferRadius_(1.0,1.0,1.0,0.2)    
    geom_box.setMaterials_([material])
    node_box = SCNNode.nodeWithGeometry_(geom_box)
    node_box.setPosition((-0.5,0.5,-0.5))
    node_root.addChildNode_(node_box)

    # camera
    camera = SCNCamera.camera()
    node_camera = SCNNode.node()
    node_camera.setCamera(camera)
    node_camera.setPosition((0,0,5.0))
    node_root.addChildNode_(node_camera)

    # Light
    light = SCNLight.light()
    light.setType_('omni')
    light.setColor_(UIColor.whiteColor().CGColor())
    node_light = SCNNode.node()
    node_light.setPosition((2.0,2.0,2.0))
    node_light.setLight_(light)
    node_root.addChildNode_(node_light)

    scene_view.setScene_(scene)

    main_view_objc.addSubview_(scene_view)

    main_view.name = 'scene kit'
    main_view.present()

main()

謎

SCNMaterial の struct LightingModel と SCNLightingModel の関係は謎。

参考

• SCNMaterial
• SCNMaterial.LightingModel
• SCNLightingModel