Hello!
I am running STK 1.2 on a Windows 10 PC (Intel NUC) with latest updates & drivers. The GMA is an Intel Iris Plus Graphics 655 (shader model 5.1), the CPU an i3-8109U @3.0 GHz. The GFX settings in STK are all set to the maximum, shadows high, and motion blur and depth of field are disabled (Blur Effects Level = 0). The FPS are around 30 (slight differences depending on the track), which is ok for us to play.
Now the problem:
When a plunger is fired forward (and only then), the GFX gets corrupted - only when shadows are enabled - i.e. the surroundings barely visible, the "floor" (texture) sometimes completely gone - see screenshots. This is not restricted to the location shown in the screenshots or to that track. Also other tracks show a similar behaviour when the plunger is fired forward. When the plunger is fired backward, there is never a GFX problem.
It seems to be related with the shadows. I.e., when I disable them, then there is no such GFX problem anymore.
Is there something, you developers can do about it? Do you need more information from me?