1 /* 2 * Copyright (c) 2009-2012 jMonkeyEngine 3 * All rights reserved. 4 * 5 * Redistribution and use in source and binary forms, with or without 6 * modification, are permitted provided that the following conditions are 7 * met: 8 * 9 * * Redistributions of source code must retain the above copyright 10 * notice, this list of conditions and the following disclaimer. 11 * 12 * * Redistributions in binary form must reproduce the above copyright 13 * notice, this list of conditions and the following disclaimer in the 14 * documentation and/or other materials provided with the distribution. 15 * 16 * * Neither the name of 'jMonkeyEngine' nor the names of its contributors 17 * may be used to endorse or promote products derived from this software 18 * without specific prior written permission. 19 * 20 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS 21 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED 22 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 23 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR 24 * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, 25 * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, 26 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR 27 * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF 28 * LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING 29 * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS 30 * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 31 */ 32 package com.jme3.terrain; 33 34 import com.jme3.material.Material; 35 import com.jme3.math.Vector2f; 36 import com.jme3.math.Vector3f; 37 import com.jme3.terrain.geomipmap.lodcalc.LodCalculator; 38 import java.util.List; 39 40 /** 41 * Terrain can be one or many meshes comprising of a, probably large, piece of land. 42 * Terrain is Y-up in the grid axis, meaning gravity acts in the -Y direction. 43 * Level of Detail (LOD) is supported and expected as terrains can get very large. LOD can 44 * also be disabled if you so desire, however some terrain implementations can choose to ignore 45 * useLOD(boolean). 46 * Terrain implementations should extend Node, or at least Spatial. 47 * 48 * @author bowens 49 */ 50 public interface Terrain { 51 52 /** 53 * Get the real-world height of the terrain at the specified X-Z coorindate. 54 * @param xz the X-Z world coordinate 55 * @return the height at the given point 56 */ 57 public float getHeight(Vector2f xz); 58 59 /** 60 * Get the normal vector for the surface of the terrain at the specified 61 * X-Z coordinate. This normal vector can be a close approximation. It does not 62 * take into account any normal maps on the material. 63 * @param xz the X-Z world coordinate 64 * @return the normal vector at the given point 65 */ 66 public Vector3f getNormal(Vector2f xz); 67 68 /** 69 * Get the heightmap height at the specified X-Z coordinate. This does not 70 * count scaling and snaps the XZ coordinate to the nearest (rounded) heightmap grid point. 71 * @param xz world coordinate 72 * @return the height, unscaled and uninterpolated 73 */ 74 public float getHeightmapHeight(Vector2f xz); 75 76 /** 77 * Set the height at the specified X-Z coordinate. 78 * To set the height of the terrain and see it, you will have 79 * to unlock the terrain meshes by calling terrain.setLocked(false) before 80 * you call setHeight(). 81 * @param xzCoordinate coordinate to set the height 82 * @param height that will be set at the coordinate 83 */ 84 public void setHeight(Vector2f xzCoordinate, float height); 85 86 /** 87 * Set the height at many points. The two lists must be the same size. 88 * Each xz coordinate entry matches to a height entry, 1 for 1. So the 89 * first coordinate matches to the first height value, the last to the 90 * last etc. 91 * @param xz a list of coordinates where the hight will be set 92 * @param height the heights that match the xz coordinates 93 */ 94 public void setHeight(List<Vector2f> xz, List<Float> height); 95 96 /** 97 * Raise/lower the height in one call (instead of getHeight then setHeight). 98 * @param xzCoordinate world coordinate to adjust the terrain height 99 * @param delta +- value to adjust the height by 100 */ 101 public void adjustHeight(Vector2f xzCoordinate, float delta); 102 103 /** 104 * Raise/lower the height at many points. The two lists must be the same size. 105 * Each xz coordinate entry matches to a height entry, 1 for 1. So the 106 * first coordinate matches to the first height value, the last to the 107 * last etc. 108 * @param xz a list of coordinates where the hight will be adjusted 109 * @param height +- value to adjust the height by, that matches the xz coordinates 110 */ 111 public void adjustHeight(List<Vector2f> xz, List<Float> height); 112 113 /** 114 * Get the heightmap of the entire terrain. 115 * This can return null if that terrain object does not store the height data. 116 * Infinite or "paged" terrains will not be able to support this, so use with caution. 117 */ 118 public float[] getHeightMap(); 119 120 /** 121 * This is calculated by the specific LOD algorithm. 122 * A value of one means that the terrain is showing full detail. 123 * The higher the value, the more the terrain has been generalized 124 * and the less detailed it will be. 125 */ 126 public int getMaxLod(); 127 128 /** 129 * Called by an LodControl. 130 * Calculates the level of detail of the terrain and adjusts its geometry. 131 * This is where the Terrain's LOD algorithm will change the detail of 132 * the terrain based on how far away this position is from the particular 133 * terrain patch. 134 * @param location the Camera's location. A list of one camera location is normal 135 * if you just have one camera in your scene. 136 */ 137 public void update(List<Vector3f> location, LodCalculator lodCalculator); 138 139 /** 140 * Lock or unlock the meshes of this terrain. 141 * Locked meshes are un-editable but have better performance. 142 * This should call the underlying getMesh().setStatic()/setDynamic() methods. 143 * @param locked or unlocked 144 */ 145 public void setLocked(boolean locked); 146 147 /** 148 * Pre-calculate entropy values. 149 * Some terrain systems support entropy calculations to determine LOD 150 * changes. Often these entropy calculations are expensive and can be 151 * cached ahead of time. Use this method to do that. 152 */ 153 public void generateEntropy(ProgressMonitor monitor); 154 155 /** 156 * Returns the material that this terrain uses. 157 * If it uses many materials, just return the one you think is best. 158 * For TerrainQuads this is sufficient. For TerrainGrid you want to call 159 * getMaterial(Vector3f) instead. 160 */ 161 public Material getMaterial(); 162 163 /** 164 * Returns the material that this terrain uses. 165 * Terrain can have different materials in different locations. 166 * In general, the TerrainQuad will only have one material. But 167 * TerrainGrid will have a different material per tile. 168 * 169 * It could be possible to pass in null for the location, some Terrain 170 * implementations might just have the one material and not care where 171 * you are looking. So implementations must handle null being supplied. 172 * 173 * @param worldLocation the location, in world coordinates, of where 174 * we are interested in the underlying texture. 175 */ 176 public Material getMaterial(Vector3f worldLocation); 177 178 /** 179 * Used for painting to get the number of vertices along the edge of the 180 * terrain. 181 * This is an un-scaled size, and should represent the vertex count (ie. the 182 * texture coord count) along an edge of a square terrain. 183 * 184 * In the standard TerrainQuad default implementation, this will return 185 * the "totalSize" of the terrain (512 or so). 186 */ 187 public int getTerrainSize(); 188 189 /** 190 * Get the scale of the texture coordinates. Normally if the texture is 191 * laid on the terrain and not scaled so that the texture does not repeat, 192 * then each texture coordinate (on a vertex) will be 1/(terrain size). 193 * That is: the coverage between each consecutive texture coordinate will 194 * be a percentage of the total terrain size. 195 * So if the terrain is 512 vertexes wide, then each texture coord will cover 196 * 1/512 (or 0.00195) percent of the texture. 197 * This is used for converting between tri-planar texture scales and regular 198 * texture scales. 199 * 200 * not needed 201 */ 202 //public float getTextureCoordinateScale(); 203 204 /** 205 * 206 * 207 */ 208 public int getNumMajorSubdivisions(); 209 } 210
