Construct an Image of a Textured Rotating Fan
| Constructs the image of a rotating two-bladed fan, and
textures the given image on all of its four faces. |
public ImageBvr textureOnFan(ImageBvr unitImForTexture) {
| quad is [-1,+1]x[-1,+1] with texture coordinates [0,1]x[0,1] |
GeometryBvr faceObj = importGeometry(buildURL(_geoBase,"quad.x"));
| Replicate to give a textured backside as well. |
faceObj = union(faceObj,
faceObj.transform(rotate(yVector3, toBvr(Math.PI))));
| Replicate both sides with a 90 degree rotation to make a fan. |
faceObj = union(faceObj,
faceObj.transform(rotate(yVector3, toBvr(Math.PI/2))));
| construct a rotation around the Y axis |
Transform3Bvr xf = rotate(yVector3, mul(localTime, toBvr(0.4)));
| construct a rotating fan with the texture |
faceObj = faceObj.texture(unitImForTexture).transform(xf);
| construct a camera with projection point at 3 and near plane at 2 |
CameraBvr cam = perspectiveCamera(toBvr(3),toBvr(2));
| use a light and obtain an image |
GeometryBvr geoWithLight = union(faceObj, directionalLight);
ImageBvr im = geoWithLight.render(cam);
return im.transform(compose(translate(0.5, 0.5),
scale2(0.4)));
}
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