Shadowmaps aren't being updated for Units in motion properly. I was trying to figure out why certain things weren't working perfectly, and have now observed and tested that the shadowmaps aren't using the same projection from rendered frame to rendered frame, causing a "flashing" effect.
It's a lot more noticable with my GLSL shadowmap implementation, which I now have working about as well as it's going to.
But it's clearly effecting stuff using the ARB shadows as well. You can watch shadows on a tank that's in motion change when it stops, if you observe closely. Something weird is going on there- it's almost like it reverses the shadowmap very briefly every sim frame.
Shadowmaps and Unit Motion
Moderator: Moderators
Re: Shadowmaps and Unit Motion
In case people aren't following the Normalmap thread... here's a screen, showing a normal, ARB-generated shadowmap projection going wrong on Unit that's moving:
You have to look carefully (click to zoom in) but it's obvious that the shadow on the Unit geometry doesn't match the shadow on the ground.
So... it really is borked engine-side, it wasn't just my imagination.
There are other things wrong with the shadowmaps currently, which I think (ok, "vaguely theorize" might be more appropriate) are due to incorrect creation of the projection taking the POV into account. I think there's something wrong with the depth component, basically. If you need to see screenshots of shadows warping or "floating" before this is credible, let me know- I usually avoid taking screens of these issues, for obvious reasons
See this source code, for an example of doing shadowmaps prior to rendering (in this case, with GLSL, but it's not necessary) using FBOs:
http://fabiensanglard.net/shadowmapping/index.php
You have to look carefully (click to zoom in) but it's obvious that the shadow on the Unit geometry doesn't match the shadow on the ground.
So... it really is borked engine-side, it wasn't just my imagination.
There are other things wrong with the shadowmaps currently, which I think (ok, "vaguely theorize" might be more appropriate) are due to incorrect creation of the projection taking the POV into account. I think there's something wrong with the depth component, basically. If you need to see screenshots of shadows warping or "floating" before this is credible, let me know- I usually avoid taking screens of these issues, for obvious reasons
See this source code, for an example of doing shadowmaps prior to rendering (in this case, with GLSL, but it's not necessary) using FBOs:
http://fabiensanglard.net/shadowmapping/index.php