3Dview上のオブジェクト頂点位置を取得してopenGLで表示する

bpyで頂点位置に10px辺の正四角形を表示するソースサンプルです。

bpy.context.object.data.vertices.coで各頂点の座標を取得。

co_3d = oa.matrix_world * v.co　でワールド内の座標に変換

co_2d = view3d_utils.location_3d_to_region_2d(viewport, area.spaces[0].region_3d, co_3d)　で3DviewのXY座標に変換しています。

	import bpy
	import bgl # OpenGLをBlender内部から利用するために必要
	from bpy_extras import view3d_utils
	bl_info = {
	"name": "",
	"author": "",
	"version": (1, 0),
	"blender": (2, 74, 0),
	"location": "",
	"description": "",
	"warning": "",
	"support": "COMMUNITY",
	"wiki_url": "",
	"tracker_url": "",
	"category": "3D View"
	}
	class RectRenderer(bpy.types.Operator):
	"""四角形を描画する"""
	bl_idname = "view3d.rect_renderer"
	bl_label = "Rect renderer"
	__handle = None # 描画関数
	# 「View3D」領域の描画関数を登録
	@staticmethod
	def handle_add():
	RectRenderer.__handle = bpy.types.SpaceView3D.draw_handler_add(
	RectRenderer.render_rect,
	(), 'WINDOW', 'POST_PIXEL')
	# 「View3D」領域の描画関数を登録解除
	@staticmethod
	def handle_remove():
	if RectRenderer.__handle is not None:
	bpy.types.SpaceView3D.draw_handler_remove(
	RectRenderer.__handle, 'WINDOW')
	RectRenderer.__handle = None
	# 「View3D」領域の描画関数本体
	@staticmethod
	def render_rect():
	oa = bpy.context.active_object
	for area in bpy.context.screen.areas:
	if area.type == 'VIEW_3D':
	viewport = area.regions[4]
	for v in bpy.context.object.data.vertices :
	#coo in 3d space
	co_3d = oa.matrix_world * v.co
	#coo in the 3d view area (2d)
	co_2d = view3d_utils.location_3d_to_region_2d(viewport, area.spaces[0].region_3d, co_3d)
	#coo in the blender window
	#co_2d_w = (co_2d[0]+viewport.x, co_2d[1]+viewport.y)
	#coo in the system screen
	#co_2d_s = (co_2d_w[0]+bpy.context.window.x, co_2d_w[1]+bpy.context.window.y)
	#display
	#print("\n\n3d space co :",co_3d,"\n2d in viewport co :",co_2d)
	#print("2d in window co :",co_2d_w,"\n2d system co :",co_2d_s)
	# 描画領域の作成
	cx = co_2d[0]
	cy = co_2d[1]
	positions = [
	[cx-10.0, cy-10.0], # 左下
	[cx-10.0, cy+10.0], # 左上
	[cx+10.0, cy+10.0], # 右上
	[cx+10.0, cy-10.0] # 右下
	]
	# OpenGLによる四角形の描画
	bgl.glEnable(bgl.GL_BLEND) # アルファブレンドの有効化
	bgl.glBegin(bgl.GL_QUADS) # 四角形の描画を開始
	bgl.glColor4f(0.7, 0.5, 0.3, 0.6) # 描画する四角形の色を指定
	for (v1, v2) in positions:
	bgl.glVertex2f(v1, v2) # 頂点の登録
	bgl.glEnd() # 四角形の描画を終了
	# スクリプトインストール時の処理
	def register():
	bpy.utils.register_module(__name__)
	RectRenderer.handle_add()
	# スクリプトアンインストール時の処理
	def unregister():
	bpy.utils.unregister_module(__name__)
	RectRenderer.handle_remove()
	if __name__ == "__main__":
	register()

view raw openGL_test.py hosted with by GitHub

参考：

[Blender] スクリプトの内部からOpenGLを利用する

how to get the vertice’s Horizontal and vertical location in the window?

以下、更新版。ポーズモードでの表示にも対応。

	import bpy
	import bgl # OpenGLをBlender内部から利用するために必要
	from bpy_extras import view3d_utils
	bl_info = {
	"name": "Tutorial: OpenGL on Blender",
	"author": "12funkeys",
	"version": (1, 0),
	"blender": (2, 74, 0),
	"location": "View3D > Tutorial: OpenGL on Blender",
	"description": "Tutorial: Use Blender's OpenGL API.",
	"warning": "",
	"support": "COMMUNITY",
	"wiki_url": "",
	"tracker_url": "",
	"category": "3D View"
	}
	class RectRenderer(bpy.types.Operator):
	"""四角形を描画する"""
	bl_idname = "view3d.rect_renderer"
	bl_label = "Rect renderer"
	__handle = None # 描画関数
	# 「View3D」領域の描画関数を登録
	@staticmethod
	def handle_add():
	RectRenderer.__handle = bpy.types.SpaceView3D.draw_handler_add(
	RectRenderer.render_rect,
	(), 'WINDOW', 'POST_PIXEL')
	# 「View3D」領域の描画関数を登録解除
	@staticmethod
	def handle_remove():
	if RectRenderer.__handle is not None:
	bpy.types.SpaceView3D.draw_handler_remove(
	RectRenderer.__handle, 'WINDOW')
	RectRenderer.__handle = None
	# 「View3D」領域の描画関数本体
	@staticmethod
	def render_rect():
	C = bpy.context
	oa = bpy.context.active_object
	for area in bpy.context.screen.areas:
	if area.type == 'VIEW_3D':
	viewport = area.regions[4]
	me = oa.to_mesh(scene=C.scene, apply_modifiers=True, settings='PREVIEW')
	me.transform(oa.matrix_world)
	print(me.vertices[0].co, " - Vert 0 (deformed/modified)")
	for v in me.vertices :
	#coo in 3d space
	co_3d = v.co
	#coo in the 3d view area (2d)
	co_2d = view3d_utils.location_3d_to_region_2d(viewport, area.spaces[0].region_3d, co_3d)
	#coo in the blender window
	#co_2d_w = (co_2d[0]+viewport.x, co_2d[1]+viewport.y)
	#coo in the system screen
	#co_2d_s = (co_2d_w[0]+bpy.context.window.x, co_2d_w[1]+bpy.context.window.y)
	#display
	#print("\n\n3d space co :",co_3d,"\n2d in viewport co :",co_2d)
	#print("2d in window co :",co_2d_w,"\n2d system co :",co_2d_s)
	# 描画領域の作成
	cx = co_2d[0]
	cy = co_2d[1]
	ms = 3.0 #markingsize
	positions = [
	[cx-ms/2, cy-ms/2], # 左下
	[cx-ms/2, cy+ms/2], # 左上
	[cx+ms/2, cy+ms/2], # 右上
	[cx+ms/2, cy-ms/2] # 右下
	]
	# OpenGLによる四角形の描画
	bgl.glEnable(bgl.GL_BLEND) # アルファブレンドの有効化
	bgl.glBegin(bgl.GL_QUADS) # 四角形の描画を開始
	bgl.glColor4f(0.7, 0.5, 0.3, 0.6) # 描画する四角形の色を指定
	for (v1, v2) in positions:
	bgl.glVertex2f(v1, v2) # 頂点の登録
	bgl.glEnd() # 四角形の描画を終了
	bpy.data.meshes.remove(me)
	# スクリプトインストール時の処理
	def register():
	bpy.utils.register_module(__name__)
	RectRenderer.handle_add()
	# スクリプトアンインストール時の処理
	def unregister():
	bpy.utils.unregister_module(__name__)
	RectRenderer.handle_remove()
	if __name__ == "__main__":
	register()

view raw markingVertices02.py hosted with by GitHub