ofxcubemap's Introduction

ofxCubeMap

Addon for working with Cube Maps in openFrameworks

Usage:

To load some images into a cubemap:

	myCubeMap.loadImages( "Cubemaps/SummerScene/cubescene_rt.jpg",
					      "Cubemaps/SummerScene/cubescene_lf.jpg",						 
					      "Cubemaps/SummerScene/cubescene_up.jpg",
					      "Cubemaps/SummerScene/cubescene_dn.jpg",
					      "Cubemaps/SummerScene/cubescene_fr.jpg",
					      "Cubemaps/SummerScene/cubescene_bk.jpg" );

Then to draw it:

	myCubeMap.bind();
		myCubeMap.drawSkybox( 800 );
	myCubeMap.unbind();

It can also be drawn using the supplied shader doing something like:

myCubeMap.bind();

	cubeMapShader.begin();
	cubeMapShader.setUniform1i("EnvMap", 0);

		myCubeMap.drawSkybox( 800 );

	cubeMapShader.end();

myCubeMap.unbind();

To initialise an FBO based cubemap that you can draw into:

myFboCubeMap.initEmptyTextures( 512 );

To draw into it in 2D, this will clear each face to black and draw a line from one corner to the other

for( int i = 0; i < 6; i++ )
{
	myFboCubeMap.beginDrawingInto2D( GL_TEXTURE_CUBE_MAP_POSITIVE_X + i );

		ofClear(0,0,0);

		ofLine(0,0, myFboCubeMap.getWidth(), myFboCubeMap.getHeight() );
		ofLine(myFboCubeMap.getWidth(), 0, 0, myFboCubeMap.getHeight() );

	myFboCubeMap.endDrawingInto2D();
}

If you want to draw your 3D scene into it, you can place it in the scene:

myFboCubeMap.setPosition( 0.0f, 40.0f, 0.0f );

And then you can draw the 3D scene into it like so:

for( int i = 0; i < 6; i++ )
{
	myFboCubeMap.beginDrawingInto3D( GL_TEXTURE_CUBE_MAP_POSITIVE_X + i );

		ofClear(0,0,0);
		drawScene();

	myFboCubeMap.endDrawingInto3D();
}

Examples coming when I get a chance.

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