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[英]how to install Pyrender on ubuntu 14.04 with headless rendering?
[英]How to get pixel coordinates of object after rendering the scene as image in pyrender?
我正在尝试获取使用 pyrender 渲染的对象的像素坐标 (x, y)。 目的是获取该对象的边界框坐标。 我使用 OffScreenRenderer 来渲染场景。
r = pyrender.OffscreenRenderer(viewport_width=640,
viewport_height=480,
point_size=1.0)
color, depth = r.render(scene)
可用信息:camera_to_world 姿势矩阵
首先,我尝试绘制对象的质心,如下所示:
x, y = trimesh_mesh.centroid[:2]
height, width = image.shape[:2]
x = int(x * width)
y = int(y * height)
plt.imshow(image)
plt.scatter(x, y)
plt.show()
我得到以下信息:图像图
同一个对象的边界框图在这里
有谁知道如何获得渲染对象的精确质心和框坐标? 谢谢你。
您正在寻找bpy_extras.object_utils.world_to_camera_view
。
像这样使用它:
import bpy
import bpy_extras
scene = bpy.context.scene
obj = bpy.context.object # object you want the coordinates of
vertices = obj.data.vertices # you will get the coordinates of its vertices
for v in vertices:
# local to global coordinates
co = v.co @ obj.matrix_world
# calculate 2d image coordinates
co_2d = bpy_extras.object_utils.world_to_camera_view(scene, camera, co)
render_scale = scene.render.resolution_percentage / 100
render_size = (
int(scene.render.resolution_x * render_scale),
int(scene.render.resolution_y * render_scale),
)
# this is the result
pixel_coords = (co_2d.x * render_size[0],
co_2d.y * render_size[1])
print("Pixel Coords:", (
round(pixel_coords[0]),
round(pixel_coords[1]),
))
在 Blender Stack Exchange 上看到这个答案
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