Multiple techniques in material

[kondor9]

Welcome

i have one question, how can i change manualy techniques in material?

i have material "one" with two technique "one" and "two". Ogre always use technique "one" but i need use technique "two".
How can i make function to manualy change technique in material?

[Rasengan]

Hey,

not so hard at all, you can get your material with MaterialManager class.

You can get your techniques, simply by passing index or names, as well as passes, texture units...etc.
You can dynamically change your techniques for sure, here is a very simple example wich show how to change a "technique attribute" with the code. I hope it can help you.

Code: Select all

Ogre::MaterialPtr matPtr = static_cast<Ogre::MaterialPtr>(Ogre::MaterialManager::getSingletonPtr()->getByName("one"));
Ogre::Technique* tech = matPtr->getTechnique("two");
tech->getPass(yourPassNameOrIndex)->setPolygonMode(Ogre::PM_WIREFRAME);

Easy, this code will set your specific material to wireframe mode.
You can set/add textures, shaders, blending modes....everything that Ogre::Material can do...

I'don't know how to force Ogre to choose a Technique(getBestTechnique() is the first declared technique wich is supported), it's seems that there is not some "Material::SetTechnique()" built in function but you can always "remove" your first technique dynamically if you want, so Ogre will take your Technique "two" automatically...

[Kukanani]

Hi,
I'm trying to do what you said about removing the technique by name, but the removeMaterial() method only takes a short int as an argument. Is there a way around this?
Thanks,
Kukanani

[Rasengan]

Ho, sry, you can get a technique by name but not remove it by name.
You can try this:

Code: Select all

Ogre::Material::TechniqueIterator it = matPtr->getTechniqueIterator();
				
unsigned int index = 0;
while (it.hasMoreElements())
{
  Ogre::Technique* tech = it.getNext();
  if ("TechNameToRemove" == tech->getName())
  {
    matPtr->removeTechnique(index);
    break; // or add a bool if you want...
  }
  ++index;
}