Vpython faces

[Saeed Akbar]

I have imported .stl model using vpython faces with the example code mentioned by bruce sherwood in one of his replies to a post.. but the problem is i have to put the object in frame... and to move the object i have to move the frame... but scene.mouse.pick selects only one object all the time... may b the frame takes the whole space... i am not sure... can anyone help me in moving face object with mouse drag when there are multiple faces in the scene... thanks in advance

[Bruce Sherwood]

I don't understand the situation. Here is a program with a sphere and faces object in a moving frame, and I can pick either the sphere or the faces object (and if I click elsewhere I correctly get None):

from visual import *

scene.range = 2

fr = frame(pos=(1,1,0))

sphere(frame=fr, pos=(0,-2,0), color=color.orange, radius=0.3)

f = faces(frame=fr, pos=[(-1,-1,0), (1,-1,0), (1,1,0), (1,1,0), (-1,1,0), (-1,-1,0)],

          color=[color.red, color.red, color.red, color.cyan, color.cyan, color.cyan])

f.make_normals()

f.make_twosided()

t = 0

while True:

    rate(30)

    fr.pos = (-0.5+sin(t),1,0)

    t += .02

    if scene.mouse.events > 0:

        scene.mouse.getevent()

        print(scene.mouse.pick)

[Saeed Akbar]

thanks for your reply... the problem is still there... the problem arises when you import an external model from .stl file. In that case when i click anywhere on the scene the same object gets selected everytime even if i click on an empty area. thanks for your cooperation... it would be nice if you give it a try but by importing .stl object... 

[Bruce Sherwood]

You need to post an entire working program that displays the problem, as I cannot reproduce it.

I started from Convert STL 3D graphics files (Derek Lura and Bruce Sherwood) in the Contributed section of vpython.org, and I replaced the final part of convert_stl.py with this:

if __name__ == '__main__':

    #print "Choose an stl file to display. Rotate!"

    # Open .stl file

    #fd = get_file()

    #if not fd: continue

    scene.width = scene.height = 800

    #scene.autocenter = True

    #newobject = stl_to_faces(fd)

    newobject = stl_to_faces('Part1.stl')

    newobject.smooth() # average normals at a vertex

    newobject.color = color.orange

    newobject.material = materials.wood

    f = newobject.frame

    t = 0

    sphere(pos=(0,-2,0), radius=0.5, color=color.red)

    while True:

        rate(30)

        f.pos = (-0.5+sin(t),-1,0)

        t += .02

        if scene.mouse.events > 0:

            scene.mouse.getevent()

            p = scene.mouse.pick

            print(p)

            if p is not None:

                scene.mouse.pick.color = color.green

When I click on the faces object the print statement shows that I clicked on it, and the object turns green. When I click on the sphere object the print statement shows that I clicked on it, and the object turns green. When I click on the background the print statement correctly shows None.

[Saeed Akbar]

I tried my code on my friend's computer.... it works fine there... i can select individual object there... So the problem is in my computer and i have to figure it out... thanks for ur time and consideration Bruce Sherwood....