import bpy
from .utils import project_points
import mathutils
import numpy as np
from ..blender.mesh import Mesh
from typing import List, Union
from .annotation_handler import AnnotationHandler
from ..blender.camera import Camera
def _get_object_axes(
object: Mesh,
camera: bpy.types.Camera = None,
scene: bpy.types.Scene = None,
normalized=True,
invert_y=True,
) -> np.ndarray:
"""Get the unit axes of an object in camera space.
:param object: Mesh
:param camera: bpy.types.Camera (if None, use bpy.context.scene.camera)
:param scene: bpy.types.Scene (if None, use bpy.context.scene)
:param normalized: if True, return normalized coordinates (0-1) instead of pixel coordinates
:param invert_y: if True, y is measured from the top of the image, otherwise from the bottom (Blender measures from bottom)
:return: (4 x 2) centroid + 3 pixel positions of ends of unit axes [XYZ] in XY
"""
if camera is None:
camera = bpy.context.scene.camera
if scene is None:
scene = bpy.context.scene
if len(object._meshes) > 1:
raise NotImplementedError("Axes only supported for single meshes")
centroid = np.array(object.centroid())
verts = np.concatenate([centroid[None, :], centroid[None, :] + object.axes], axis=0)
coords_2d = project_points(verts, scene, camera, invert_y=invert_y)
if normalized:
coords_2d[:, 0] /= scene.render.resolution_x
coords_2d[:, 1] /= scene.render.resolution_y
return coords_2d
def _get_objects_axes(
objects: List[Mesh],
camera: bpy.types.Camera = None,
scene: bpy.types.Scene = None,
normalized: bool = False,
invert_y: bool = True,
) -> List[np.ndarray]:
"""Run `get_axes` for multiple objects
:param objects: List of Mesh objects
:param camera: bpy.types.Camera (if None, use bpy.context.scene.camera)
:param scene: bpy.types.Scene (if None, use bpy.context.scene)
:param normalized: if True, return normalized coordinates (0-1) instead of pixel coordinates
:param invert_y: if True, y is measured from the top of the image, otherwise from the bottom (Blender measures from bottom)
"""
return [
_get_object_axes(
obj, camera=camera, scene=scene, normalized=normalized, invert_y=invert_y
)
for obj in objects
]
[docs]
def get_axes(
objects: List[Mesh],
camera: Union[Camera, List[Camera]] = None,
scene: bpy.types.Scene = None,
normalized: bool = False,
invert_y: bool = True,
) -> AnnotationHandler:
"""Project local axes for all objects into all cameras
:param objects: List of Mesh objects
:param camera: Either a single :class:`~blendersynth.blender.camera.Camera` object, or a list of them. If None, use bpy.context.scene.camera
:param scene: bpy.types.Scene (if None, use bpy.context.scene)
:param normalized: if True, return normalized coordinates (0-1) instead of pixel coordinates
:param invert_y: if True, y is measured from the top of the image, otherwise from the bottom (Blender measures from bottom)
"""
return_dict = {}
if camera is None:
camera = bpy.context.scene.camera
if not isinstance(camera, list):
camera = [camera]
for cam in camera:
return_dict[cam.name] = _get_objects_axes(
objects, camera=cam, scene=scene, normalized=normalized, invert_y=invert_y
)
return AnnotationHandler.from_annotations(return_dict, ann_type="axes")