Examples of javax.media.j3d.SpotLight

javax.media.j3d.SpotLight

The SpotLight object specifies an attenuated light source at a fixed point in space that radiates light in a specified direction from the light source. A SpotLight has the same attributes as a PointLight node, with the addition of the following:

Direction - The axis of the cone of light. The default direction is (0.0, 0.0, -1.0). The spot light direction is significant only when the spread angle is not PI radians (which it is by default).

Spread angle - The angle in radians between the direction axis and a ray along the edge of the cone. Note that the angle of the cone at the apex is then twice this value. The range of values is [0.0,PI/2] radians, with a special value of PI radians. Values lower than 0 are clamped to 0 and values over PI/2 are clamped to PI. The default spread angle is PI radians.

Concentration - Specifies how quickly the light intensity attenuates as a function of the angle of radiation as measured from the direction of radiation. The light's intensity is highest at the center of the cone and is attenuated toward the edges of the cone by the cosine of the angle between the direction of the light and the direction from the light to the object being lit, raised to the power of the spot concentration exponent. The higher the concentration value, the more focused the light source. The range of values is [0.0,128.0]. The default concentration is 0.0, which provides uniform light distribution.

A spot light contributes to diffuse and specular reflections, which depend on the orientation and position of an object's surface. A spot light does not contribute to ambient reflections.

    BoundingSphere bounds = new BoundingSphere(new Point3d(0.0,0.0,0.0), Double.MAX_VALUE);




    //A spotlight rotating around the scene.
    Color3f lightColourSpot = new Color3f(0.3f, 0.3f, 0.3f);
    SpotLight lightSpot = new SpotLight(lightColourSpot,
                                     new Point3f(0.0f,0.0f,1.0f),
                                     new Point3f(0.1f,0.1f,0.01f),
                                     new Vector3f(0.0f,0.0f,-1.0f),
                                     (float) (Math.PI/4),
                                     0.0f);


    lightSpot.setInfluencingBounds(bounds);








    //The transformation group for the spotlight and its rotation.

/* 197 */       break;
/*     */     case 1:
/* 199 */       this.light = new PointLight(this.color, defaultPos, this.attenuation);
/* 200 */       break;
/*     */     case 2:
/* 203 */       this.light = new SpotLight(this.color, defaultPos, this.attenuation, defaultDir, 2.0F * this.spotConeAngle, 0.0F);
/*     */ 
/* 205 */       break;
/*     */     }
/*     */ 
/* 211 */     this.light.setCapability(15);

/* 68 */     ((SpotLight)this.node).setSpreadAngle(in.readFloat());
/* 69 */     ((SpotLight)this.node).setConcentration(in.readFloat());
/*    */   }
/*    */ 
/*    */   protected SceneGraphObject createNode() {
/* 73 */     return new SpotLight();
/*    */   }

Examples of javax.media.j3d.SpotLight

Related Classes of javax.media.j3d.SpotLight