RenderPass based SSAO

[mvaligursky]

• implementation of SSAO using render passes
• few small improvements compared to the implementation using the post-effects (increasing number of samples does not modify the brightness, exposed additional controls ..)

no SSAO

un-blured SSAO

blurred SSAO

[Maksims]

minAngle does not seem to do anything?

[mvaligursky]

minAngle does not seem to do anything?

hey, last minute change for it to work as a preset. Fixed now, thanks @Maksims
It avoids ambient occlusion by low tessellated geometry - visible on the inside of the curve as those polygons create occlusion lines:

but it's also used to avoid occlusion when scaling is used.