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How to apply a texture to a visual object |
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Texturing, also called texture mapping, is a way to add the visual richness of a
surface without adding the fine geometric details. The visual richness is provided
by an image, also called a texture, which gives the appearance of surface detail
for the visual object. The image is mapped on to the geometry of the visual object
at rendering time.
You may apply a texture to a virtual object according to this recipe:
- Prepare texture images
- Load the texture
- Set the texture in Appearance bundle
- Specify TextureCoordinates of Geometry
class TextureApp extends JFrame{
// Create a Texture object
private Texture createTexture() {
String filename = "brick.gif";
// Load the texture
TextureLoader loader = new TextureLoader(filename, null);
ImageComponent2D image = loader.getImage();
if (image == null) {
System.out.println("load failed for texture: " + filename);
}
// can't use parameterless constuctor
Texture2D texture = new Texture2D(Texture.BASE_LEVEL, Texture.RGBA,
image.getWidth(), image.getHeight());
texture.setImage(0, image);
return texture;
}
private BranchGroup createSceneGraph(SimpleUniverse su){
...
MyBox box=new MyBox(0.4f,0.4f);
// Set the texture in Appearance hundle
Appearance appear=box.getAppearance();
appear.setTexture(createTexture());
// Map the texture coordinate
TexCoord2f[] texCoords = new TexCoord2f[24];
for (int i = 0; i < texCoords.length; i += 4) {
texCoords[i] = new TexCoord2f(0.0f, 0.0f);
texCoords[i + 1] = new TexCoord2f(0.0f, 1.0f);
texCoords[i + 2] = new TexCoord2f(1.0f, 1.0f);
texCoords[i + 3] = new TexCoord2f(1.0f, 0.0f);
}
QuadArray quadArray=(QuadArray)box.getGeometry();
quadArray.setTextureCoordinates(0, 0, texCoords);
objSpin.addChild(box);
...
}
...
}
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