3d-viewer: add option to clip silkscreen around via annular ring
In the raytracing engine in 3d-viewer, add a flag to specify that the silkscreen layers are clipped at the edges of via annular rings rather than the edge of the drill hole copper plating. This expands the clipping region and so more conservatively shows what silkscreen markings might be disrupted by vias. It makes it easier to visually identify potential problematic areas.
Question for reviewers:
- I presume having a flag to control this is a good idea. To what should I connected the flag (e.g. a new UI option in the 3d viewer)?