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"""Compute 3D world coordinates from 2D screen pixel coordinates
(hover mouse to place the points)"""
from vedo import *
settings.default_font = "Ubuntu"
settings.use_depth_peeling = True
def func(evt): # this is the callback function
i = evt.at # the renderer nr. which is being hit
pt2d = evt.picked2d # 2D screen coordinate
# passing a list of meshes will force the points to be placed on any of them
pt3d = plt.at(i).compute_world_coordinate(pt2d, objs=[objs[i]])
if mag(pt3d) < 0.01:
return
newpt = Point(pt3d).color(i)
txt.text(f'2D coords: {pt2d}\n3D coords: {pt3d}\nNpt = {len(plt.objects)}')
txt.color(i) # update text and color on the fly
plt.at(i).add(newpt).render() # add new point and render i
# create an empty text (to be updated in the callback)
txt = Text2D("", s=1.4, font='Brachium', c='white', bg='green8')
# create two polygonal meshes
mesh1 = TessellatedBox()
mesh2 = ParametricShape('ConicSpiral')
mesh2.c('indigo1').lc('grey9').lw(1)
objs = [mesh1, mesh2]
plt = Plotter(N=2, bg='blackboard', axes=1, sharecam=False)
plt.add_callback('mouse move', func)
plt.at(0).show(mesh1, __doc__, viewup='z')
plt.at(1).show(mesh2, txt, zoom=1.4)
plt.interactive().close()
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