|
There are two basic parts to simulating (or faking) shadows: computing where the
shadows are, and creating geometry (or textures) to serve as the shadow.
A polygon specified without material properties can be used as a shadow polygon,
called a colored shadow polygon. The color of the shadow polygon, specified by
either geometry or with a ColoringAttributes object, is chosen to appear as the
object in shade.
This program illustrates how to simulate the Shadow by shadow ploygon.
// Define a Shadow Polygon Class
public class SimpleShadow extends Shape3D {
SimpleShadow(GeometryArray geom, Vector3f direction, Color3f col,
float height) {
int vCount = geom.getVertexCount();
QuadArray poly = new QuadArray(vCount, GeometryArray.COORDINATES
| GeometryArray.COLOR_3);
int v;
Point3f vertex = new Point3f();
Point3f shadow = new Point3f();
for (v = 0; v < vCount; v++) {
geom.getCoordinate(v, vertex);
shadow.set(vertex.x + (vertex.y - height) * direction.x,
height + 0.0001f, vertex.z +
(vertex.y - height) * direction.y);
poly.setCoordinate(v, shadow);
poly.setColor(v, col);
}
this.setGeometry(poly);
}
}
public BranchGroup createScene(){
...
// This is the plane object which has the Shadow
Shape3D plane = new LitQuad(new Point3f(-0.3f, 0.6f, 0.2f),
new Point3f(-0.3f, -0.3f, 0.2f),
new Point3f(0.6f, -0.3f, -0.3f),
new Point3f(0.6f, 0.6f, -0.3f));
...
// Create a Shadow Polygon object
Shape3D shadow = new SimpleShadow((GeometryArray) plane.getGeometry(),
direction, new Color3f(0.2f, 0.2f, 0.2f), -0.5f);
// Add the Shadow Polygon object into the scene
scene.addChild(shadow);
...
}
|
Related Tips
|
Page 1 of 0 ( 0 comments )
Other API Tips 
You can share your information about this topic using the form below!
Please do not post your questions with this form! Thanks.