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Laureηt 2022-04-14 11:33:39 +02:00
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Lighting.java
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@ -1,76 +1,98 @@
import java.lang.*; import java.util.*; import algebra.*;
import java.lang.*;
import java.util.*;
import algebra.*;
/* * The Lighting class describes a scene lighting environment
* @author: gmorin, smondet */
public class Lighting {
static final int NONE = 0 ; static final int AMBIENT = 1 ;
static final int POINT = 2 ;
List lights ;
/* Internal Class describing a light source */
static final int NONE = 0;
static final int AMBIENT = 1;
static final int POINT = 2;
List lights;
/* Internal Class describing a light source */
private class Light {
public int type = NONE;
public double[] params;
public Light (int type, double []params) {
this.type = type; this.params = params;
public Light(int type, double[] params) {
this.type = type;
this.params = params;
}
}
public Lighting() {
lights = new LinkedList(); }
/* Adds a new ambient light source of intensity @ia to the environment. */
public void addAmbientLight (double ia) {
double [] v = new double[1];
v[0] = ia; lights.add (new Light (AMBIENT, v)); }
lights = new LinkedList();
}
/* Adds a new ambient light source of intensity @ia to the environment. */
public void addAmbientLight(double ia) {
double[] v = new double[1];
v[0] = ia;
lights.add(new Light(AMBIENT, v));
}
/** Addsa */
public void addPointLight (double x, double y, double z, double id)
{
public void addPointLight(double x, double y, double z, double id) {
double[] v = new double[5];
v[0] = x; v[1] = y; v[2] = z; v[3] = id;
lights.add (new Light (POINT, v)); }
/* Computes the illuminated color of a 3D points of given position, normal and color,
v[0] = x;
v[1] = y;
v[2] = z;
v[3] = id;
lights.add(new Light(POINT, v));
}
/*
* Computes the illuminated color of a 3D points of given position, normal and
* color,
* and given the camera position and material parameters.
* Returns an array of size 3. */
public double[] applyLights (Vector3 position, Vector3 normal, double[] color,
Vector3 cameraPosition,
double ka, double kd, double ks, double s)
{
* Returns an array of size 3.
*/
public double[] applyLights(Vector3 position, Vector3 normal, double[] color,
Vector3 cameraPosition,
double ka, double kd, double ks, double s) {
double[] litColor = new double[3];
/* total light intensity */
double I = 0.0;
Iterator it = lights.iterator ();
while (it.hasNext ()){
Light light = (Light) it.next ();
Iterator it = lights.iterator();
while (it.hasNext()) {
Light light = (Light) it.next();
switch (light.type) {
case AMBIENT:
/* Ambient light : A COMPLETER */
/* I += ... */
/* I += ... */
break;
case POINT:
try {
/* vector from point to camera center */
Vector3 e = new Vector3 (cameraPosition);
e.subtract (position);
e.normalize ();
/* vector from point to light*/
Vector3 l = new Vector3 (light.params[0], light.params[1], light.params[2]);
l.subtract (position);
l.normalize ();
/* half-vector between e and l*/
Vector3 h = new Vector3 (e);
h.add (l);
h.normalize ();
/* diffuse contribution : A COMPLETER */
/* double Id = ... */
/* specular contribution : A COMPLETER */
/* double Is = ... */
/* I += Id + Is;*/
} catch (InstantiationException ex) { /* should not reach*/ }
catch (SizeMismatchException ex) { /* should not reach*/ }
/* vector from point to camera center */
Vector3 e = new Vector3(cameraPosition);
e.subtract(position);
e.normalize();
/* vector from point to light */
Vector3 l = new Vector3(light.params[0], light.params[1], light.params[2]);
l.subtract(position);
l.normalize();
/* half-vector between e and l */
Vector3 h = new Vector3(e);
h.add(l);
h.normalize();
/* diffuse contribution : A COMPLETER */
/* double Id = ... */
/* specular contribution : A COMPLETER */
/* double Is = ... */
/* I += Id + Is; */
} catch (InstantiationException ex) {
/* should not reach */ } catch (SizeMismatchException ex) {
/* should not reach */ }
break;
default:
/* ignore unknow lights */
break;
}
}
litColor[0] = I * color[0]; litColor[1] = I * color[1]; litColor[2] = I * color[2];
}
litColor[0] = I * color[0];
litColor[1] = I * color[1];
litColor[2] = I * color[2];
return litColor;
}
}