1 /*
2  * Copyright (c) 2009-2010 jMonkeyEngine
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4  *
5  * Redistribution and use in source and binary forms, with or without
6  * modification, are permitted provided that the following conditions are
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12  * * Redistributions in binary form must reproduce the above copyright
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31  */
32 
33 package com.jme3.terrain.geomipmap.lodcalc;
34 
35 import com.jme3.export.InputCapsule;
36 import com.jme3.export.JmeExporter;
37 import com.jme3.export.JmeImporter;
38 import com.jme3.export.OutputCapsule;
39 import com.jme3.terrain.Terrain;
40 import com.jme3.terrain.geomipmap.TerrainQuad;
41 import java.io.IOException;
42 
43 
44 /**
45  * Just multiplies the terrain patch size by 2. So every two
46  * patches away the camera is, the LOD changes.
47  *
48  * Set it higher to have the LOD change less frequently.
49  *
50  * @author bowens
51  */
52 public class SimpleLodThreshold implements LodThreshold {
53 
54     private int size; // size of a terrain patch
55     private float lodMultiplier = 2;
56 
57 
SimpleLodThreshold()58     public SimpleLodThreshold() {
59     }
60 
SimpleLodThreshold(Terrain terrain)61     public SimpleLodThreshold(Terrain terrain) {
62         if (terrain instanceof TerrainQuad)
63             this.size = ((TerrainQuad)terrain).getPatchSize();
64     }
65 
SimpleLodThreshold(int patchSize, float lodMultiplier)66     public SimpleLodThreshold(int patchSize, float lodMultiplier) {
67         this.size = patchSize;
68     }
69 
getLodMultiplier()70     public float getLodMultiplier() {
71         return lodMultiplier;
72     }
73 
setLodMultiplier(float lodMultiplier)74     public void setLodMultiplier(float lodMultiplier) {
75         this.lodMultiplier = lodMultiplier;
76     }
77 
getSize()78     public int getSize() {
79         return size;
80     }
81 
setSize(int size)82     public void setSize(int size) {
83         this.size = size;
84     }
85 
86 
getLodDistanceThreshold()87     public float getLodDistanceThreshold() {
88         return size*lodMultiplier;
89     }
90 
write(JmeExporter ex)91     public void write(JmeExporter ex) throws IOException {
92         OutputCapsule oc = ex.getCapsule(this);
93         oc.write(size, "size", 16);
94         oc.write(lodMultiplier, "lodMultiplier", 2);
95     }
96 
read(JmeImporter im)97     public void read(JmeImporter im) throws IOException {
98         InputCapsule ic = im.getCapsule(this);
99         size = ic.readInt("size", 16);
100         lodMultiplier = ic.readInt("lodMultiplier", 2);
101     }
102 
103     @Override
clone()104     public LodThreshold clone() {
105         SimpleLodThreshold clone = new SimpleLodThreshold();
106         clone.size = size;
107         clone.lodMultiplier = lodMultiplier;
108 
109         return clone;
110     }
111 
112     @Override
toString()113     public String toString() {
114         return "SimpleLodThreshold "+size+", "+lodMultiplier;
115     }
116 }
117