Dynamic lights on moving brush models

[qbism]

[leileilol]

I don't know. The funny thing is that the shadows show up fine where dynamic lights can't (such as the DM2 megahealth/grenade train). The shadow system is a simplified duplicate of the dlight system.

[mankrip]

As mh said, this kind of fix doesn't take BSP rotation into account. I may implement support for dynamic lighting on rotating brushes someday, but since none of the original maps uses it this is good enough for now.

Does Engoo support rotating brushes? dm2 has a 90 degree angle rotation set in its worldspawn entity. I don't think that may be the cause, but it's worth a look.
Either that, the blob shadows code or something else may be causing it. There's no problem with the dynamic lighting of those dm2 places in Makaqu.

[mh]

For rotation what you'd ideally do is (1) load an identity matrix onto the brush model, transform it as normal, then (2) multiply the resulting matrix from 1 by the current MVP for drawing the entity, and (3) inverse the resulting matrix from 1 for lighting. (4) multiply the light position by the inverse matrix to get it's transformed position then proceed as before.

That works perfectly with a hardware accelerated engine, but for software you'll obviously need to do a little more work.

e3m3 also has rotation set in it's worldspawn.

[mankrip]

[mh]

[mankrip]

[leileilol]

[Baker]

I forgot there was a tutorial on this.

Problems - 1

[mh]

Have fun when you come to do the matrix inversion. You really need it for rotating bmodels and GL's stack just doesn't cut it. Best you can do is glPushMatrix/glLoadIdentity/run transforms in reverse order/glGetfloat/glPopMatrix, then do it all again normally. When I implemented this in Quake II I just used D3D's matrix library - it worked fine in GL.

[Baker]

I've hated this problem for so long ... I've rather satisfied with the results of this.

This was a great one. I have never liked that world submodels don't behave as part of the proper world.

http://www.youtube.com/watch?v=bWFFe9bCB5s

[mh]

It's one of those things that can be quite subtle a hell of a lot of the time, but once you start noticing it there's no going back.

[mh]

[Baker]

[mankrip]