Given that we compare the dot product (square of length) to s_min_dot,
it means that s_min_dot also needs to be square, or we wind up
converting line segments into circles that are visually distinct from
circles, leading to gaps in polylines.
(cherry picked from commit 0823692dda)
* Split and rewrite the preview window and canvas.
* Create a new class for handling the board information.
* Adds new render targets: openGL, legacy, and ray tracing.
* Render targets take full advantage of the new 3D plugins system and 3D cache
for a fast 3D model loading.
* Faster board loading.
* New OpenGL render is faster than the old one.
* New ray tracing render target with a post processing shader.
* Use of new 3D plugins (WRL, X3D, STEP and IGES) and 3D model caching.
* Preview of 3D model while browsing the file name.
* 3D preview of the footprint while adding / align 3D shapes.
* Render of 3D models according to attributes: Normal, Normal+Insert, Virtual.
* Pivot rotation centered in one point over the PCB board.
* Shortcuts keys improved for XYZ orientation..
* Animated camera.
Simon Schubert
Simon Richter
Mrio Luzeiro
Jon Neal
Mario Luzeiro