Textured Light (l4d2 style)

[white_waluigi]

Is there a way to create a textured spotlight in Ogre like in L4d2? So that you can make the light look like an actual flashlight? Normal lights just seam to prefect and are therefore a bit unatural.

(you have to look close to see that it is actaully textured)


(I know that this Picture is a modded Flashlight, but im sure it explains the Problem better)

[Zonder]

Search decal

[white_waluigi]

The Flashlight should still throw shadows,react to materials correctly, etc.. i'm not sure if a decal is capable of doing that.

[Xavyiy]

A deferred spotlight would work like a charm. Otherwise, using forward rendering, you will have to adapt all your materials in order to correctly handle this textured spotlight.

[white_waluigi]

K ill try it out, thx.
But i suppose this means there is no build in function for textured light?

[Xavyiy]

Btw, I remember that Ogre3D used to automatically handle textures in spotlight's shadows, I assume that "rendering" the light with extra passes (modulative shadows). Although this is not physically correct, might work for you. Have a look to the wiki / API / showcase demos, I'm sure it has been showcased before.

If you want to look at some code, have a look to OgreSceneManager.cpp -> renderModulativeTextureShadowedQueueGroupObjects. If I remember correctly, this hardcoded texture thing was there.

[white_waluigi]

ok, ill have a look at it, thx.

[Xavyiy]

There is built-in support, but as far as I can see in OgreSceneManager.cpp, the texture to be used is hardcoded:

Code: Select all

targetPass->getTextureUnitState(1)->getTextureName() == "spot_shadow_fade.png"
...
 TextureUnitState* t = 
                        targetPass->createTextureUnitState("spot_shadow_fade.png");
                    t->setProjectiveTexturing(!targetPass->hasVertexProgram(), cam);

This *shit* really needs to be rewritten... we will see in Ogre 2.X

But, with minor changes there, you will be able to use whatever texture you want.

[white_waluigi]

Yeah i hope that this is implemented soon. It seams a little bit gimicky but with a little bit of fantasy im sure you could realise some realy fun stuff.
I hope i can find a way to replace the png, but it seams to be hardcoded for whatever reason.
Thx.

[spacegaier]

This *shit* really needs to be rewritten... we will see in Ogre 2.X

As usual: Please create a short JIRA ticket for it, otherwise it might get lost!

[Xavyiy]

Done: https://ogre3d.atlassian.net/browse/OGRE-337

[al2950]

Just in case this is any help, someone tried to do this or something similar not too long ago;
http://www.ogre3d.org/forums/viewtopic.php?f=4&t=67475