CODEWITHSUNDEEP
opengl3ddepthpyopenglglulookat
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Reputation: 1

pyOpenGL Is it necessary to draw an object every time when call glReadPixels?

I want to get depth buffer images that have been captured from different views of a 3D object. To do this with pyOpenGL I use the following code

def get_depth(LookAt_x, LookAt_y, LookAt_z)

    glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT)
    glLoadIdentity()
    gluLookAt(LookAt_x, LookAt_y, LookAt_z, 0, 0, 0, 0, 1, 0)
    draw_object() // glBegin() for ... glvertex3f........ glEnd()
    glReadBuffer(GL_FRONT)
    depth_image = glReadPixels(0, 0, image_size, image_size, GL_DEPTH_COMPONENT, GL_FLOAT)

def draw_object(self):
    glBegin(GL_TRIANGLES)
    for tri in self.get_triangles():
        glNormal3f(tri.normal.x,tri.normal.y,tri.normal.z)
        glVertex3f(tri.points[0].x,tri.points[0].y,tri.points[0].z)
        glVertex3f(tri.points[1].x,tri.points[1].y,tri.points[1].z)
        glVertex3f(tri.points[2].x,tri.points[2].y,tri.points[2].z)
    glEnd()

code link: https://www.linux.com/blog/python-stl-model-loading-and-display-opengl

I call this function with different viewpoints LookAt_x, LookAt_y, LookAt_z. However, to draw the object every time costs too much time.

Is there a possible way, once the object is drawn, just change viewpoints to get depth images?

Upvotes: 0

Views: 289

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