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motion
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motion.java
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1996-10-17
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// "Motion Shadow Effect"
// created by ask@krc.sony.co.jp (Masamichi zzzcat Asukai)
//
// Copyright(C) 1996 Sony Corporation. All rights reserved.
//
import vrml.*;
import vrml.node.*;
import vrml.field.*;
public class motion extends Script {
private SFRotation setRotation;
private SFVec3f setScale;
private Node tree;
private Node light;
private float[] s_rot = {0.0f, 1.0f, 0.0f, 0.0f};
private float[] s_scale = {1.0f, 1.0f, 1.0f};
private float[] t_trans = new float[3];
private float[] t_scale = new float[3];
private float[] l_trans = new float[3];
private float[] vec = new float[3];
private float d;
// constructor
public void initialize() {
setRotation = (SFRotation)getEventOut("setRotation");
setScale = (SFVec3f)getEventOut("setScale");
tree = (Node)((SFNode)getField("tree")).getValue();
light = (Node)((SFNode)getField("light")).getValue();
// get translation and scale of tree
((SFVec3f)tree.getExposedField("translation")).getValue(t_trans);
((SFVec3f)tree.getExposedField("scale")).getValue(t_scale);
}
public void processEvent(Event e) {
if (e.getName().equals("interval")) {
// get translation of light
((SFVec3f)light.getExposedField("translation")).getValue(l_trans);
////////////////////
// SHADOW ROTATION
////////////////////
// normalized light vector on X-Z plane
vec[0] = t_trans[0] - l_trans[0];
vec[2] = t_trans[2] - l_trans[2];
d = (float)java.lang.Math.sqrt(vec[0]*vec[0] + vec[2]*vec[2]);
vec[0] /= d;
vec[2] /= d;
// rotation of shadow
if (vec[0] < 0.0) {
s_rot[3] = (float)java.lang.Math.acos(-vec[2]);
} else {
s_rot[3] = -(float)java.lang.Math.acos(-vec[2]);
}
// set rotation of shadow
setRotation.setValue(s_rot);
////////////////////
// SHADOW LENGTH
////////////////////
// whether light height is higher than top of tree
if (l_trans[1] < t_scale[1]) {
s_scale[2] = 0.0f;
} else {
s_scale[2] = d / (l_trans[1] - t_scale[1]);
}
// set length of shadow
setScale.setValue(s_scale);
}
}
}