Cura: Make the model preview show correctly on black color

[Liger0]

Is your feature request related to a problem? Please describe.
Yes, I can't see the models correctly and can't move, rotate etc correctly as I can't see them as I would like to.

Describe the solution you'd like
Change color instead of that dark gray, and make the shades more visible

Describe alternatives you've considered
-

Affected users and/or printers
Cr-10s but probably all of them

Additional context
This is the cr-10 v6 heavy mount. There are a lot of holes but none can actually be seen....

[nallath]

If you rotate your camera, do you see the shading change? Because that is the effect i'm getting (eg; The camera has a light source on the same position, which should make specular reflection be visible on the model)

[fieldOfView]

If the 3d view had less ambient light, more shading would be visible on darker colors.

[Ghostkeeper]

No, reducing the ambient light has no effect. It only makes the object darker. We do have diffuse (Lambert) shading, but since the light is in the camera there will always be a position where multiple different normal vectors are rendered with the same colour. I can do the same thing with this calibration model:

The real problem is that the light source is always located on the camera. Increasing the strength of diffuse shading relative to ambient makes curves more pronounced, but it won't force some surfaces to become darker than others because they happen to be oriented away from the light; the light can always be moved so that up to 3 surfaces are equally far rotated.

However placing the light in a fixed location makes it hard to see things that then fall into the shadow.

[fieldOfView]

Quite right.

How about two lights then? One on the camera, one fixed position.

[Ghostkeeper]

That could be a way to approach this, yes. The fixed light shouldn't need to be very strong.

[LipuFei]

For dev, JIRA ticket: CURA-6723

[Liger0]

Still not solved. :\