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(ursina) Prevent partially transparent model

I'm using Ursina with Python3.8 to do some 3D world stuff.

I wanted to load in a 3D model of the portal gun, just to see if I could do it. I've done that sucessfully, but it looks weird. I've attached some screenshots so you can see what I mean.

As far as I can tell, it looks like the surface i'm looking at on the model is transparent... and i'm seeing the inside of the model.
I want the portal gun to look the way it does in the real Portal games
Does anyone know how I can prevent the weird transparency so it doesn't show the inside of the model?

The line of code I used to add the entity in-game:
Entity(model='portal_gun.fbx', position=(.5,3,.25), scale=.08, origin_z=-.5, rotation_z=0, color=pcolor, on_cooldown=False, name="gun", texture=("/models/tex/w_portalgun.png"), shader=unlit_shader)
For context, it does this with both 'unlit_shader' and 'lit_with_shadows_shader'
I'm using this 3D model: https://sketchfab.com/3d-models/portal-gun-from-portal-2-original-model-80fc291d695a4fe69e7941e96c0f53b3

angle 1 of portal gun angle 2 of portal gun



source https://stackoverflow.com/questions/72426045/ursina-prevent-partially-transparent-model

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