Sphere actor does not appear when vertices and faces are used

[nasimanousheh]

Description

When I use 'theta' and 'phi' parameters in sphere actor, I can see the spheres in the window. But I don't see any spheres when I use 'vertices' and 'faces' parameters.

Here is the code sample to verify the issue:

from fury import actor, primitive, window
import fury
print(fury.__version__)
print(fury.__file__)
import numpy as np

scene = window.Scene()
sphere_res = 'symmetric362'
vertices, faces = primitive.prim_sphere(name=sphere_res,
                                        gen_faces=False)
pos = 10 * np.random.rand(100, 3)
colors = 100 * np.ones((100, 3), dtype='uint8')
radii_spheres = 2+np.random.rand(100)
sphere_actor = actor.sphere(centers=pos,
                                colors=colors,
                                radii=radii_spheres,
                                vertices=vertices,
                                faces=faces)
scene.add(sphere_actor)
window.show(scene)

Thank you all!

[skoudoro]

Hi @nasimanousheh,

Thank you for pointing that out.

I see several potential mistakes:

• colors is between [0-1]. I don't think you need to multiply by 1000
• vertices, faces, have only 1 sphere (and you want 100 spheres), they are not duplicating after. So you have to do it yourself.
• why do you prim_sphere? I do not see the goal here

I need to tests your example but it will be good if you could check these 2 points first.

[nasimanousheh]

Thank you for the corrections.
I fixed the code, but still the problem is not solved.
why do you prim_sphere? Currently, I'm using sphere actor in my application. There are 906 vertices in each sphere and it takes time to visualize more than1000 spheres. I want to use prim_sphere with less vertices (362 vertices or even 100 vertices).

from fury import actor, primitive, window
import fury
import numpy as np

scene = window.Scene()
vertices, faces = primitive.prim_sphere(name='symmetric362',
                                        gen_faces=False)
pos = np.array([[0,0,0]])
sphere_actor = actor.sphere(centers=pos,
                            colors=1,
                            radii=0.5,
                            vertices=vertices,
                            faces=faces)
scene.add(sphere_actor)
window.show(scene)

[skoudoro]

ok, we will look into this issue.

a temporary solution for you is:

from fury import actor, primitive, window, utils
import fury
import numpy as np

scene = window.Scene()
vertices, faces = primitive.prim_sphere(name='symmetric362',
                                        gen_faces=False)
pos = np.array([[0,0,0]])
res = primitive.repeat_primitive(vertices, faces, centers=pos)
big_verts, big_faces, big_colors, _ = res
sphere_actor = utils.get_actor_from_primitive(big_verts, big_faces, big_colors)
scene.add(sphere_actor)
window.show(scene)

[SunTzunami]

I tried debugging it, there are perhaps three functions that can contain clues - primitive.prim_sphere, actor.sphere (which in turn uses utils.repeat_sources). I think primitive.prim_sphere works fine as I tried it and it returned the correct vertices and faces for the 'symmetric362' sphere. This leaves actor.sphere and utils.repeat_sources.
When I don't typecast the vertices on this line, it seems to work as can be seen in this preview-

What I mean when I say that I don't typecast is that instead of vertices.astype(np.int8) I simply use vertices.
PTAL @nasimanousheh , @skoudoro.

Thank you for the corrections.
I fixed the code, but still the problem is not solved.
why do you prim_sphere? Currently, I'm using sphere actor in my application. There are 906 vertices in each sphere and it takes time to visualize more than1000 spheres. I want to use prim_sphere with less vertices (362 vertices or even 100 vertices).

from fury import actor, primitive, window
import fury
import numpy as np

scene = window.Scene()
vertices, faces = primitive.prim_sphere(name='symmetric362',
                                        gen_faces=False)
pos = np.array([[0,0,0]])
sphere_actor = actor.sphere(centers=pos,
                            colors=1,
                            radii=0.5,
                            vertices=vertices,
                            faces=faces)
scene.add(sphere_actor)
window.show(scene)