2 UV maps on mesh - 1 with alpha? (warning! contains images)

[nixnerd]

Hello,

I'd like to use multiple UV maps on a mesh, one of which will be using alpha. Do any of the native mesh file formats that Irrlicht uses support this?

I'd also want to animate the mesh and have the texture maps animate accordingly. The pictures below can explain what I'm trying to do, better than I can.


Here's a test UV mapped .x mesh in the viewer, with the .jpeg UV bitmap thats applied to it.



Here's a test UV mapped .x mesh in the viewer, with a .tga UV map with an alpha channel. Also is the view of the same tga file in the Gimp, showing the alpha. I've also included images of the 'channels' and 'layers' tool for the same image.


Here's what I want to achieve, using multiple image maps, one of which has an alpha channel. I want to use the two separate UV maps on the same mesh and combine them using the Irrlich engine and code, rather than combining them into one texture using a paint program.

I'm not sure what I'm doing so far is correct, as I'm a complete newbie when it comes to Irrlicht. If someone can post some code as an example, or explain what I need to do next to achieve the effect I'm looking for, I would be very appreciative.

[Guest]

http://irrlicht.sourceforge.net/docu/st ... erial.html

thats the way to load 2 textures and you can click the "ITexture" and it will show how to load one or 2 as an alpha

and when you animate you wesh "deforms" accordingly and the texture does to automaticly. so you dont have to worry about that and by the way my name on the forums is xtheagonyscenex private message if you need help.

[nixnerd]

Thnks xtheagonyscenex, I'll look at that

[nixnerd]

I've updated my original question to now include some pictures.

As everyone may have guessed I'm still needing some guidance on how I can do multitexture uv maps one of which includes alpha.

[Guest]

you need to seperate the 2 and load one at a time in the api you can load a texture and an aplha_texture so look at it

[Guest]

this is from the link a gave ealier

Code: Select all

SMaterial()
00237                 : AmbientColor(255,255,255,255), DiffuseColor(255,255,255,255),
00238                 EmissiveColor(0,0,0,0), SpecularColor(255,255,255,255), Texture1(0), Texture2(0),
00239                         MaterialType(EMT_SOLID), Wireframe(false), Lighting(true),
00240                         ZBuffer(true), ZWriteEnable(true), BackfaceCulling(true),
00241                         GouraudShading(true), Shininess(0.0f), MaterialTypeParam(0.0f),
00242                         BilinearFilter(true), TrilinearFilter(false), FogEnable(false),
00243                         NormalizeNormals(false)

[xtheagonyscenex]

what do you want to do only show the smileys or what?

[nixnerd]

what do you want to do only show the smileys or what?

Im trying to load an X file that conatins a UV mapped image (the red, green and blue box mesh), then I want to also load another UV mapped image with an alph channel and attach it to the same mesh.

The effect I'm trying to achieve is to map the 'smiley faces' on top of the red, blue and green texture in a way that overlays the smiley faces on top of the existing texture, as in the last image in my first post

[nixnerd]

Well, i've made some slight progress.



I've managed to piece together the following code, which loads an .x uv textured mesh. Now I've just got to try and figure out how to apply the 2nd texture with the alpha on top of the existing texture

Code: Select all

/*
This is a test compile to:
     1) Set up GL Redering
     2) Load a UV mapped .X file
     3) Map and additional texture onto the mesh 
*/

#include <irrlicht.h>

using namespace irr;

using namespace core;
using namespace scene;
using namespace video;
using namespace io;
using namespace gui;

#pragma comment(lib, "Irrlicht.lib"

int main()
{
  // Set up video driver
IrrlichtDevice *device = createDevice(EDT_OPENGL, dimension2d<s32>(320, 240), 16, false, false, false, 0);

  if (device == 0)
    return 1;

IVideoDriver* driver = device->getVideoDriver();
ISceneManager* smgr = device->getSceneManager();
IGUIEnvironment* guienv = device->getGUIEnvironment();
 
device->setWindowCaption(L"Texture Test");

IAnimatedMesh* mesh = smgr->getMesh("mesh/cube_uv_map.x");
IAnimatedMeshSceneNode* node = smgr->addAnimatedMeshSceneNode( mesh );

if (node)
{
	node->setMaterialFlag(EMF_LIGHTING, false);
	node->setMaterialTexture( 0, driver->getTexture("mesh/cube_colours.jpg") );
}
 
 // add a camera scene node 
	smgr->addCameraSceneNodeMaya();
	
 while(device->run())
{
   	driver->beginScene(true, true, SColor(0,128,128,128));

	smgr->drawAll();
	guienv->drawAll();

	driver->endScene();
}
	device->drop();
 return 0;
}
            

[nixnerd]

Drat, tried to add in the alphamap stuff and can see no difference at all. Is it because I'm using GL?, What am I doing wrong here?

Code: Select all

/*
This is a test compile to:
     1) Set up GL Redering
     2) Load a UV mapped .X file
     3) Map and additional texture onto the mesh 
*/

#include <irrlicht.h>

using namespace irr;

using namespace core;
using namespace scene;
using namespace video;
using namespace io;
using namespace gui;

#pragma comment(lib, "Irrlicht.lib"

int main()
{
  // Set up video driver
IrrlichtDevice *device = createDevice(EDT_OPENGL, dimension2d<s32>(320, 240), 16, false, false, false, 0);

  if (device == 0)
    return 1;

IVideoDriver* driver = device->getVideoDriver();
ISceneManager* smgr = device->getSceneManager();
IGUIEnvironment* guienv = device->getGUIEnvironment();
 
device->setWindowCaption(L"Texture Test");

device->getVideoDriver()->setTextureCreationFlag(irr::video::ETCF_ALWAYS_32_BIT,true);
device->getVideoDriver()->setTextureCreationFlag(irr::video::ETCF_ALWAYS_16_BIT,false);
device->getVideoDriver()->setTextureCreationFlag(irr::video::ETCF_CREATE_MIP_MAPS,false);

   IAnimatedMesh* boxMesh = smgr->getMesh("mesh/cube_uv_map.x");
   IAnimatedMeshSceneNode* box = smgr->addAnimatedMeshSceneNode(boxMesh);
   box->setMaterialFlag(EMF_LIGHTING, false);

   ITexture* box_alpha = driver->getTexture("mesh/cube_alpha.tga");
   driver->makeColorKeyTexture(box_alpha, position2d<s32>(0,0));

   box->getMaterial(0).Texture1 = box_alpha;
   box->getMaterial(0).BackfaceCulling = false;

   box->setMaterialType(EMT_TRANSPARENT_ALPHA_CHANNEL);
  
// add a camera scene node 
	smgr->addCameraSceneNodeMaya();
	
 while(device->run())
{
   	driver->beginScene(true, true, SColor(0,128,128,128));

	smgr->drawAll();
	guienv->drawAll();

	driver->endScene();
}
	device->drop();
 return 0;
}
                  

[Bluelight]

How do I make a picture file of the mesh from every angle to create a texture containing all the grafics needed on lets say, a human?

Face, fron, back in same picture/image..
Unwraping and so on..
I'm using 3dsmax7

[Guest]

Try finding a 3dmax forum and ask there.

How do I make a picture file of the mesh from every angle to create a texture containing all the grafics needed on lets say, a human?

Face, fron, back in same picture/image..
Unwraping and so on..
I'm using 3dsmax7

[luckymutt]

@infernus - Don't hijack the man's thread. Start your own, preferrably with a question about Irrlicht.

@nixnerd - i am not so sure this can be done, the more I think about it. Even if you can get them to both display, they are located in the same position in space and will be "competing" for which gets shown, regardless of the order that they are loaded.
In fact, with what you have now, it may very well be that both are shown, but the one is drowning out the other.

Try this:
on your solid color image, cut out circles that correspond to your smilies which become alpha, keeping your code as it is.
This will tell you whether or not they are both showing up at least, and if indeed they are competing for display is washing out the smilies.
Make sense?

[nixnerd]

Thanks for the tip luckymutt, I'll have a play around and see what I can deduce

@infernus - Don't hijack the man's thread. Start your own, preferrably with a question about Irrlicht.

@nixnerd - i am not so sure this can be done, the more I think about it. Even if you can get them to both display, they are located in the same position in space and will be "competing" for which gets shown, regardless of the order that they are loaded.
In fact, with what you have now, it may very well be that both are shown, but the one is drowning out the other.

Try this:
on your solid color image, cut out circles that correspond to your smilies which become alpha, keeping your code as it is.
This will tell you whether or not they are both showing up at least, and if indeed they are competing for display is washing out the smilies.
Make sense?

[nixnerd]

OK, here's a challenge, can *Anyone* get this to work?

Here's the code I'm using:

Code: Select all

/*
This is a test compile to:
     1) Set up GL Redering
     2) Load a UV mapped .X file
     3) Map and additional texture onto the mesh 
*/

#include <irrlicht.h>

using namespace irr;

using namespace core;
using namespace scene;
using namespace video;
using namespace io;
using namespace gui;


#pragma comment(lib, "Irrlicht.lib"

scene::ISceneNode* SkyBox = 0;

int main()
{
  // Set up video driver
IrrlichtDevice *device = createDevice(EDT_OPENGL, dimension2d<s32>(320, 240), 16, false, false, false, 0);

  if (device == 0)
    return 1;

IVideoDriver* driver = device->getVideoDriver();
ISceneManager* smgr = device->getSceneManager();
IGUIEnvironment* guienv = device->getGUIEnvironment();
 
device->setWindowCaption(L"Texture Test");

device->getVideoDriver()->setTextureCreationFlag(irr::video::ETCF_ALWAYS_32_BIT,true);
device->getVideoDriver()->setTextureCreationFlag(irr::video::ETCF_ALWAYS_16_BIT,false);
device->getVideoDriver()->setTextureCreationFlag(irr::video::ETCF_CREATE_MIP_MAPS,false);

   IAnimatedMesh* boxMesh = smgr->getMesh("mesh/cube_uv_alpha_map.x");
   IAnimatedMeshSceneNode* box = smgr->addAnimatedMeshSceneNode(boxMesh);
   box->setMaterialFlag(EMF_LIGHTING, false);

   ITexture* box_alpha = driver->getTexture("mesh/cube_alpha.tga");
   driver->makeColorKeyTexture(box_alpha, position2d<s32>(0,0));

   box->getMaterial(0).Texture1 = box_alpha;
   box->getMaterial(0).BackfaceCulling = false;

   box->setMaterialType(EMT_TRANSPARENT_ALPHA_CHANNEL);
   
   	SkyBox = smgr->addSkyBoxSceneNode(
		driver->getTexture("mesh/media/irrlicht2_up.jpg"),
		driver->getTexture("mesh/media/irrlicht2_dn.jpg"),
		driver->getTexture("mesh/media/irrlicht2_lf.jpg"),
		driver->getTexture("mesh/media/irrlicht2_rt.jpg"),
		driver->getTexture("mesh/media/irrlicht2_ft.jpg"),
		driver->getTexture("mesh/media/irrlicht2_bk.jpg"));
  
// add a camera scene node 
	smgr->addCameraSceneNodeMaya();
	
 while(device->run())
{
   	driver->beginScene(true, true, SColor(0,128,128,128));

	smgr->drawAll();
	guienv->drawAll();

	driver->endScene();
}
	device->drop();
 return 0;
}
   

Here's what I'm getting




Here's downloads for the mesh, code and textures

4 meg texture 1 file!
4 meg texture 2 file!
mesh file in .x format
The code - ready to compile

Any help would be appreciated