[SOLVED] Replace material on many objects, "material selector"

[anton.stetz]

Hi all

 

I need to be able to replace materials on the objects through code.

 

Example:

I have material "sample_01", which is assigned to many objects and surfaces in the current scene. Now I want all of these objects to assign material "sample_02", then sample_03 etc.

These materials are in the same library, and have a clear structure by name.

 

My idea:

temp = sample_01.getObjects ();

temp.setMaterial (sample_02);

 

But the functions of type material :: getObjects in documentation is not found.

 

Now I look in the direction of Material :: saveState and Material :: restoreState.

 

Maybe you have any other solutions to this issue?

 

thanks in advance

 

 

[ulf.schroeter]

Anton, what effect do you want to achive ? In general modification of the assigned material instance (in your case "sample_01") instead of trying to replace it on all surfaces should be the way to follow, therefore save()/restore() sounds promissing     

[anton.stetz]

Thanks for reply!

I need a library of materials in my application, to be able to change the color and type of roof, wall, floor

 

 

 

[ulf.schroeter]

1. For each material sub-type create a reference material instance e.g. roof_type, wall_type in addition to your _1, _2, _3... material variants
2. Asssign these reference materials to your geometry
3. Swap materials on-the-fly by:
4. serialization of selected variant _1. _2, .. material to Buffer stream (in-memory) via Material::saveState( buffer )
5. Call Material::restoreState( buffer ) on reference material instance

This should swap your scene materials without much effort 

[anton.stetz]

Thanks Ulf, i will test it today

[anton.stetz]

	void select(Material curMat, Material varMat) {
		Buffer buffer = new Buffer();					// new memory buffer
		curMat = engine.materials.findMaterial(curMat);			// current material on objects
		Material temp_mat = engine.materials.findMaterial(varMat);	// temp material to store variants
		temp_mat.saveState(buffer);					// store material in temp
	
		curMat.restoreState(buffer);					// restore material settings to current material
		//buffer.clear();
		log.message("select_yes\n");
	}

and then

	select("roof_type","roof_type_2");

but don't work

[frustum]

Please add a seekSet() call before restoreState().

buffer.seekSet(0);
curMat.restoreState(buffer);

[anton.stetz]

Ok, thanks, it works

[ulf.schroeter]

BTW, just as a hint: you define select(Material curMat, Material varMat), but actually string parameters are provided. Then curMat string parameter will be used to find material and curMat then will be assigned a Material instance (or NULL). Though UNIGINE as untyped script language supports this, I wouldn't recommend it.

[anton.stetz]

Thanks Ulf, i think about  another solution