Camera Model

class Trans {

Point3 ptViewRef = new Point3(0, 0, 0); // 注視点の3次元座標

double theta, phi, R; // 視点位置（Ｒ、θ、Φ）

double cos_theta=1., cos_phi=1., sin_theta=0., sin_phi=0.;

Trans() { }

public void setVRpnt( double x, double y, double z) {

ptViewRef = new Point3(x,y,z); } // 注視点の設定

public void setview(double r, double the, double ph) {

theta=the; phi=ph; R=r; } // 視点の設定

public void preper() { // 変換マトリックスの係数計算

double d2r= Math.PI/180.;

cos_theta =Math.cos(theta*d2r); sin_theta = Math.sin(theta*d2r);

cos_phi = Math.cos(phi*d2r); sin_phi = Math.sin(phi*d2r);

}

public Point3 tranfrm(Point3 point) { // 透視変換(3次元?3次元）

Point3 p1 = new Point3(); Point3 p2 = new Point3();

// 平行移動

p1.x = point.x ? ptViewRef.x;

p1.y = point.y ? ptViewRef.y;

p1.z = point.z ? ptViewRef.z;

// 座標回転

double xy = cos_theta*p1.x+sin_theta*p1.y;

p2.z =(R-cos_phi*xy-sin_phi*p1.z)/R;

p2.x = cos_theta*p1.y-sin_theta*p1.x;

p2.y = cos_phi * p1.z ? sin_phi * xy;

return p2;

}

public Point project (Point3 point) { // 投影（3次元?2次元）

Point3 p1= tranfrm(point);

Return new Point((int)(p1.x/p1.z), (int)(p1.y/p1.z));

}

class Point3 {

public double x, y, z;

Point3() { }

Point3(double ox, double oy, double oz) {

x = ox; y = oy; z = oz; }

}