How could I use Viz3d module in opencv-python?

changej · September 19, 2021, 2:07am

I hope use viz3d in python!Thank you!

crackwitz · September 19, 2021, 2:33am

I see attempts to support this in the contrib repo…

official docs don’t show the existence of bindings yet, so it must have been merged after the last release. it might be available in master branches (build it yourself) or maybe it’ll be included in the next release.

sturkmen · September 19, 2021, 6:05am

Python bindings for Viz module is available in version:4.5.2. on Windows OS probably you need to built OpenCV with VTK support

crackwitz · September 19, 2021, 12:36pm

docs should reflect that. they don’t show python signatures for the viz module.

since docs and python bindings are both auto-generated from the same source, I have my doubts.

docs:
https://docs.opencv.org/4.5.2/d1/d19/group__viz.html

laurent.berger · September 19, 2021, 2:07pm

You can start with python sample :

github.com

opencv/opencv_contrib/blob/master/modules/viz/samples/viz_sample_01.py

import numpy as np
import cv2 as cv

v = cv.viz.Viz3d_create("Viz Demo")

print("First event loop is over")
v.spin()
print("Second event loop is over")
v.spinOnce(1, True)
while not v.wasStopped():
    v.spinOnce(1, True)
print("Last event loop is over")

github.com

opencv/opencv_contrib/blob/master/modules/viz/samples/viz_sample_02.py

import numpy as np
import cv2 as cv

my_window = cv.viz_Viz3d("Coordinate Frame")

axe = cv.viz_WCoordinateSystem()
axis = cv.viz_WLine((-1.0,-1.0,-1.0), (1.0,1.0,1.0), cv.viz_Color().green())
axis.setRenderingProperty(cv.viz.LINE_WIDTH, 4.0);
my_window.showWidget("axe",axis)
plan = cv.viz_WPlane((-1.0,-1.0,-1.0), (1.0,.0,.0), (-.0,.0,-1.0))
#my_window.showWidget("plan", plan)
cube = cv.viz_WCube((0.5,0.5,0.0), (0.0,0.0,-0.5), True, cv.viz_Color().blue())

my_window.showWidget("Cube Widget",cube)
pi = np.arccos(-1)
print("First event loop is over")
my_window.spin()
print("Second event loop is over")
my_window.spinOnce(1, True)
translation_phase = 0.0

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github.com

opencv/opencv_contrib/blob/master/modules/viz/samples/viz_sample_03.py

import numpy as np
import cv2 as cv

def load_bunny():
    with open(cv.samples.findFile("../viz/data/bunny.ply"), 'r') as f:
        s = f.read()
    ligne = s.split('\n')
    if len(ligne) == 5753:
        pts3d = np.zeros(shape=(1,1889,3), dtype=np.float32)
        pts3d_c = 255 * np.ones(shape=(1,1889,3), dtype=np.uint8)
        pts3d_n = np.ones(shape=(1,1889,3), dtype=np.float32)
        for idx in range(12,1889):
            d = ligne[idx].split(' ')
            pts3d[0,idx-12,:] = (float(d[0]), float(d[1]), float(d[2]))
    pts3d = 5 * pts3d
    return cv.viz_WCloud(pts3d)

myWindow = cv.viz_Viz3d("Coordinate Frame")
axe = cv.viz_WCoordinateSystem()
myWindow.showWidget("axe",axe)

This file has been truncated. show original

or to gel all binding in opencv_contrib/modules/viz/misc/python/test/test_viz_simple.py at master · opencv/opencv_contrib · GitHub

It is opencv_contrib you will need to build opencv with opencv_contrib (even with master) your self. You must build vtk before opencv

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How could I use Viz3d module in opencv-python?

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