OpenGL Volumetric Lighting

[varmint]

Over the holidays and in between family stuff I thought it'd be kewl to have some volumetric lighting in Irrlicht for flashlights, car lights, street lights, etc. I looked around and didn't see anything so whipped up this little thing.

It's far from 100% and could still use some work, but it's far enough along for our purposes, so I figured to post it for others.

Feel free to use it / modify it and improve it. It's been tested in Mac and Windows and against the latest SVN head.

I started with CCubeSceneNode frame and went from there.

1) in ISceneManager.h add the following just before addCubeSceneNode

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      //! adds Volume Lighting Scene Node.
      //! the returned pointer must not be dropped.
      virtual ISceneNode* addVolumeLightSceneNode(ISceneNode* parent=0, s32 id=-1,
         const s32 subdivU = 32, const s32 subdivV = 32,
         const video::SColor foot = video::SColor(51, 0, 230, 180),
         const video::SColor tail = video::SColor(0, 0, 0, 0),
         const core::vector3df& position = core::vector3df(0,0,0),
         const core::vector3df& rotation = core::vector3df(0,0,0),
         const core::vector3df& scale = core::vector3df(1.0f, 1.0f, 1.0f)) = 0;


2) in CSceneManager.h add the following just before addCubeSceneNode

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      //! adds Volume Lighting Scene Node.
      //! the returned pointer must not be dropped.
      virtual ISceneNode* addVolumeLightSceneNode(ISceneNode* parent=0, s32 id=-1,
         const s32 subdivU = 32, const s32 subdivV = 32,
         const video::SColor foot = video::SColor(51, 0, 230, 180),
         const video::SColor tail = video::SColor(0, 0, 0, 0),
         const core::vector3df& position = core::vector3df(0,0,0),   const core::vector3df& rotation = core::vector3df(0,0,0),   const core::vector3df& scale = core::vector3df(1.0f, 1.0f, 1.0f));


3) In CSceneManager.cpp add the following just before #include "CCubeSceneNode.h"

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#include "CVolumeLightSceneNode.h"


4) In CSceneManager.cpp add the following just before addCubeSceneNode block

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//! adds Volume Lighting Scene Node.
//! the returned pointer must not be dropped.
ISceneNode* CSceneManager::addVolumeLightSceneNode(ISceneNode* parent, s32 id,
   const s32 subdivU, const s32 subdivV,
   const video::SColor foot,
   const video::SColor tail,
   const core::vector3df& position, const core::vector3df& rotation, const core::vector3df& scale)
{
   if (!parent)
      parent = this;

   ISceneNode* node = new CVolumeLightSceneNode(parent, this, id, subdivU, subdivV, foot, tail, position, rotation, scale);
   node->drop();

   return node;
}


5) Now copy and add CVolumeLightSceneNode.cpp and CVolumeLightSceneNode.h to your project and build irrlicht.


To use I used the meshViewer to test it. Add the following code, I added it just before the main loop to draw everything.

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   //test for volume lighting
   scene::ISceneNode * n = smgr->addVolumeLightSceneNode(NULL, -1,
                        32, //Sub Divid U
                        32, //Sub Divid V
                        video::SColor(30, 255, 255, 255),   //foot colour
                        video::SColor(0, 255, 0, 0)         //tail colour
                        );
   
   if (n) {
      n->setScale(core::vector3df(66.0f, 75.0f, 66.0f));
      video::SMaterial& mat = n->getMaterial(0);
      mat.setTexture(0, smgr->getVideoDriver()->getTexture("lightFalloff.png"));
   }


Code Links
http://shadow.krabbit.com/varmint/volLight/CVolumeLightSceneNode.cpp
http://shadow.krabbit.com/varmint/volLight/CVolumeLightSceneNode.h
test image
http://shadow.krabbit.com/varmint/volLight/lightFalloff.png

enjoy

[FuzzYspo0N]

wow varmint thats really cool!

Im gonna look at including it in my game that im making now, just for fun...

I like the way u use it too, its neat.

[FlyingIsFun1217]

I can't wait to see more of these kind of things added into the main SVN branch, so that multiple people start looking through it and make it even better

FlyingIsFun1217

[MasterGod]

It Looks Amazing!! - If something like this isn't going into the library core I'm gonna kill someone

[bitplane]

Wow how did I miss that? Looks really cool.
To be included in the engine it would need the new material stuff to be in an IMaterialRenderer, and the drawing the buffer part use drawMeshBuffer. And of course directx materials too.
May use it myself as it is though

[Dorth]

Hmmm, may I suggest a patch/addition forum to be added? Maybe people could only reply and dev post/move topics there?

That way, good things like this and a couple of others wouldn't get lost in the pile. Either they'd adapt tobe included, were included or take too much time / no longer be needed and moved back to another topic / closed. That way, active stuff is all and any topic open in that section.

[varmint]

thx for comments I'm always shy about me code

Just posted an update. Works better now in scenes and stuff.

[varmint]

Wow how did I miss that? Looks really cool.
To be included in the engine it would need the new material stuff to be in an IMaterialRenderer, and the drawing the buffer part use drawMeshBuffer. And of course directx materials too.
May use it myself as it is though

I'd love to add it in with DirectX support. Problem I was having and reason for calling opengl commands directly is I didn't see a way to set the footer and tail colours of the verts, with Alpha. Is there away to do this?

I dew have a

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   driver->setMaterial(Buffer->Material);
   driver->drawVertexPrimitiveList(
         Buffer->getVertices(), Buffer->getVertexCount(),
         Buffer->getIndices(), Buffer->getIndexCount() / 4 ,
         Buffer->getVertexType(), EPT_QUADS);


in there.. intended for this purpose
Also I'm working on motion trails based on the same type of logic, using QUADS.. I could add that in too It uses Empty Scene Nodes as markets were to render them.

[varmint]

actually I was working with EMT_ONETEXTURE_BLEND and pack_texureBlendFunc i can probably dew it with

[hybrid]

You should change to tri lists/strips for cross driver compatibility, because quads are not supported in d3d.

[MasterGod]

1. Awesome
2. Please post more screen shots

[varmint]

Converted to tris and added to SVN trunk.

Direct 3D 9 Screenie




OpenGL on OSX screenie

[MasterGod]

No way it looks so good!!!
Amazing work there varmint!! I Love it.

[etcaptor]

Awesome! This is will be a great addition to engine.

[doqkhanh]

Thank you very much. This is great feature!
But my demo program has been crashed after replaced irrlicht.dll with new dll build from modified code by your topic.