Physics and Terrains - WebGL Game Development - page 268

return this._dw;
}
TerrainData.prototype.get_dh=function() {
return this._dh;
}
TerrainData.prototype.get_sw=function() {
return this._segmentsW;
}
TerrainData.prototype.get_sh=function() {
return this._segmentsH;
}
TerrainData.prototype.get_heights=function(i1,j1) {
return this.geomtery.getHeights(i1,j1);
}
TerrainData.prototype.get_maxHeight=function(){
return this._maxHeight;
}
The preceding class holds the complete information of the terrain, height,
width, segment information, and also the depth of each segment. We pass the
TerrainData object to the physics engine and the engine checks for collisions
with the provided information.
Open Plane.js from primitive/game to see the use of the TerrainData object. We
have added a new function, initializeRigidBody . The following is a code snippet
from the Plane.js file:
Plane= inherit(StageObject, function (width, height,
widthOfSegments, heightOfSegments,textureName,modifyHeight){
...
this.geometry=new PlaneGeometry(width, height, widthOfSegments,
heightOfSegments,this.modifyGeometry);
...
});
The preceding code initializes the geometry, and it PlaneGeometry
constructor initializes the heights[[]] array.
Plane.prototype.initializeRigidBody=function(){
var pos=jigLib.Vector3DUtil.create( 0, 0,0,0 );
var matrix3D = new jigLib.Matrix3D();
matrix3D.appendRotation(0, jigLib.Vector3DUtil.X_AXIS);
var terrain=new TerrainData(this.width,
this.height,this.ws,this.wh,this.geometry);
this.rigidBody=new jigLib.JTerrain(terrain);
this.rigidBody.moveTo(pos);
this.rigidBody.setOrientation(matrix3D);
}