Decal System / Manager

[RdR]

Because there was no decent decal system / manager around here I wrote my own. You can easily add new decals and decalable meshes (or how do you call it)

Features
- Multiple 'decalable' meshes
- Decal size, orientation & rotation
- Decal Max distance
- Decal Lifetime
- Decal Fade out + fade out time

How to use

Code: Select all

 
// Create decal manager
DecalManager* decalManager = new DecalManager(smgr);
 
// Set terrain and add some meshes where decals can be placed
decalManager->setTerrain(terrain);
decalManager->addMesh(wallNode);
decalManager->addMesh(rockNode);
 
// Create a decal
irr::core::vector3df position = irr::core::vector3df(123, 10, 123);     // Position to place the decal
irr::core::vector3df dimension = irr::core::vector3df(2, 2, 2);         // Dimension of decal 
irr::core::vector3df normal = irr::core::vector3df(0, 1, 0);            // Orientation of the decal
irr::f32 textureRotation = 45;                                          // Rotation in degrees
irr::scene::ISceneNode* parent = 0;                                     // Parent
irr::f32 lifeTime = 0;                                                  // Time to life
irr::f32 distance = 250;                                                // Max viewing distance
 
decalManager->addDecal("mydecal.png", position, dimension, normal, textureRotation, parent, lifeTime, distance);
 

Screenshot



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TODO
- Triangle clipping

[shadowslair]

Looks like your build is libgcc.dll dependent. Despite that the code looks very clean and well organised. Well, maybe except for the java brackets. But very nice overall. Will take a look at the actual methods you use when I find some time. Thanks for sharing.

PS: Triangle clipping is a bit trickier to get right.

[RdR]

Looks like your build is libgcc.dll dependent..

Ah thanks for noticing, added the libs so should be working now.

PS: Triangle clipping is a bit trickier to get right

Hehe yep it is, that's why its not done yet

Despite that the code looks very clean and well organised. Well, maybe except for the java brackets.

Haha that are the code conventions of our project

[Lonesome Ducky]

How do you get around z fighting? Do you move the decal triangles out or do you do some z-buffer fiddling?

Triangle clipping really shouldn't be that hard. If a triangle is not fully inside, find the points where the lines forming the the triangle intersect the box, and use them as the vertices for the new triangles.

[RdR]

How do you get around z fighting? Do you move the decal triangles out or do you do some z-buffer fiddling?

I move the triangles out by using the original triangle normal.
Is there a better way to do this?

Triangle clipping really shouldn't be that hard. If a triangle is not fully inside, find the points where the lines forming the the triangle intersect the box, and use them as the vertices for the new triangles.

Yeah but still have to keep in mind which intersection belongs to the previous triangle.
If 2 of the 3 vertexes are outside of the box, you get 3 triangles in return.

Any comments for improvements are welcome

[netpipe]

YAAAAaaaaaaa!! you rock!

[hybrid]

How do you get around z fighting? Do you move the decal triangles out or do you do some z-buffer fiddling?

I move the triangles out by using the original triangle normal.
Is there a better way to do this?

I'm not sure if Irrlicht 1.7 supports it, but at least for 1.8 we have the depth bias setting in materials. There you can define some kind of an add-on value for rendered meshes. The mesh is automatically displaced by that value on the GPU.

[RdR]

YAAAAaaaaaaa!! you rock!

Glad you appreciate it

[I'm not sure if Irrlicht 1.7 supports it, but at least for 1.8 we have the depth bias setting in materials. There you can define some kind of an add-on value for rendered meshes. The mesh is automatically displaced by that value on the GPU.

Ah nice, we moved to Irrlicht 1.8 (trunk) earlier this week so ill take a look at that.

[Virion]

awesome stuff you got there!! time to splat blood everywhere!!

[jorgerosa]

Sounds big and cool! Great work! Thanks for share it! I´ll try it asap!

[tbw]

Really awesome! Thanks for sharing!
btw I got some memory leaks. I fixed them by changing

Code: Select all

DecalSceneNode::~DecalSceneNode() 
{
        if (this->mesh)
                this->mesh->drop();
}

and by adding

Code: Select all

meshBuffer->drop();

before

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batchingMesh->finalize();
return batchingMesh;

in

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irr::scene::IMesh* DecalManager::createMesh(irr::core::aabbox3df box, irr::core::matrix4 rotationMatrix) 

[RdR]

Really awesome! Thanks for sharing!
btw I got some memory leaks. I fixed them by changing

Code: Select all

DecalSceneNode::~DecalSceneNode() 
{
        if (this->mesh)
                this->mesh->drop();
}

and by adding

Code: Select all

meshBuffer->drop();

before

Code: Select all

batchingMesh->finalize();
return batchingMesh;

in

Code: Select all

irr::scene::IMesh* DecalManager::createMesh(irr::core::aabbox3df box, irr::core::matrix4 rotationMatrix) 

Thanks for noticing!
I added it to the source

awesome stuff you got there!! time to splat blood everywhere!!

Hehe

[RdR]

Update:
- Fixed fade out tranparency
- Added some basic funtions

[Masterhawk]

Nice snippet This would have been the next task for me to create a decal system on my own for my editor. Now you saved me a lot of time. Thx

[Virion]

AWESOME!!