how to transparent texture 3d model ( fade in fade out )

[koller202]

how to transparent texture 3d model ( fade in fade out )

i can use in 2d image

but in 3d my texture model can t use

thankyou
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JUSTIN BIEBER

[arras]

You need to set material of your scene node to use alfa chanell of your texture. Look at API for more info.

[koller202]

how

Code: Select all

void irr::scene::ISceneNode::setMaterialTexture  (  u32  textureLayer,  
  video::ITexture *  texture 
 )  [inline] 

sorry i can t do it

T_T
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Dodge colt history

[Dorth]

Then I'm terribly sorry but if with the tutorial, the documentation, the api and the search function you can't even get a basis working with which we could help you, then it's quie likelly you're trying something that is out of your league, at least for now. Pratice coding, read a lot on site like gamedev and forums like his one, try small things then try it out yourself THEN come for help with any problems ou might still have.

Good luck

[arras]

Look at video::SMaterial Class Reference. SMaterial have public atribute MaterialType. It can be se to type which suports alpha chanel of texture. EMT_TRANSPARENT_ALPHA_CHANNEL is one you are probably looking for.

To change material type of node, use ISceneNode function setMaterialType(video::E_MATERIAL_TYPE newType).

So your code will look something like:

Code: Select all

yournode->setMaterialType(EMT_TRANSPARENT_ALPHA_CHANNEL);

Of course your texture have to have some transparency. Use png format to load transparent textures or use IVideoDriver::makeColorKeyTexture() function to make one from ordinary texture.

For fade in/ out effect EMT_TRANSPARENT_VERTEX_ALPHA might be more useful. In this material type vertex transparency is used to make node transparent. You need to get mesh buffer out of node then acces vertices and change their transparency one by one.

[koller202]

- -

i did t mean this

(1) i want to use 1 texture in my node 3d and use fadein fadeout texture

(2) i mean this

Code: Select all

		driver->draw2DImage(SPscreen, core::position2d<s32>(256,280), 
			rect<s32>(0,0,512,128), 0, 
			SColor(255,255,255,255), true); 

(in 2d graphic ) i can set transpent in SColor(this,255,255,255)
variable this i can control transpent
but now i want control node transpent it myself

sorry i bad english thank you everyone
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Toyota avalon (concept)

[hybrid]

Yes, but you have to change to the vertex alpha material first. Then you can use the setVertexColorAlpha meshmanipulator to change the alpha values of all vertices to the desired value. You can also use alpha_channel material and change the textures accordingly, but the former is usually faster.
The fastest version should be the shader based version, though. Search the snippets forum for it.

[koller202]

thankyou hybird

use shader or setVertexColorAlpha
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Daihatsu Move

[koller202]

i can do it

Code: Select all

  scene::IMesh * mesh=smgr->getMesh("../../media/sydney.md2")->getMesh(0); 
   smgr->getMeshManipulator()->setVertexColors( mesh, video::SColor( 0, 20, 20, 20 ) ); 
   scene::ISceneNode *Aqua = smgr->addMeshSceneNode(mesh); 
   Aqua->setMaterialFlag(video::EMF_LIGHTING, false);    
  // Aqua->setAutomaticCulling(false); 
   Aqua->setMaterialFlag(video::EMF_BACK_FACE_CULLING, false); 
   Aqua->setMaterialType(video::EMT_TRANSPARENT_VERTEX_ALPHA  ); 
   Aqua->setMaterialTexture(0, driver->getTexture("../../media/sydney.bmp"));

thx
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Marijuana indica

[Irme]

Ok, so i've gotten your code to work to set a meshes alpha so that its translucent

but how do i change it on a node after i've added the mesh to it?

[koller202]

u mean fade in fade out in mesh ?

smgr->getMeshManipulator()->setVertexColors( mesh, video::SColor( ****, *****, *****, ***** ) );
change in 255 is 100 % transparent 0 is 0 % transparent
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Diets advice