heightmap data

game-lib.js

@@ -3247,6 +3247,108 @@ GameLib.D3.Game.prototype.LinkPair = function (
     });
 };
 
+
+/* * * * * * * * * *
+ * Heightmap Tools
+ * * * * * * * * * */
+
+GameLib.D3.HeightmapData = function (
+    sizeX,
+    sizeY,
+    matrix
+) {
+    this.sizeX = sizeX || 0;
+    this.sizeY = sizeY || 0;
+
+    // 2D Array with height data
+    // Column-major
+    this.matrix = matrix || [];
+};
+
+
+// Note: this currently only works for cannon!
+GameLib.D3.GenerateThreeMeshFromHeightField = function (
+    heightFieldShape
+    // Physics type.....
+) {
+
+    var geometry = new THREE.Geometry();
+
+    var v0 = new CANNON.Vec3();
+    var v1 = new CANNON.Vec3();
+    var v2 = new CANNON.Vec3();
+
+    var shape = heightFieldShape;
+    for (var xi = 0; xi < shape.data.length - 1; xi++) {
+        for (var yi = 0; yi < shape.data[xi].length - 1; yi++) {
+            for (var k = 0; k < 2; k++) {
+                shape.getConvexTrianglePillar(xi, yi, k===0);
+                v0.copy(shape.pillarConvex.vertices[0]);
+                v1.copy(shape.pillarConvex.vertices[1]);
+                v2.copy(shape.pillarConvex.vertices[2]);
+                v0.vadd(shape.pillarOffset, v0);
+                v1.vadd(shape.pillarOffset, v1);
+                v2.vadd(shape.pillarOffset, v2);
+                geometry.vertices.push(
+                    new THREE.Vector3(v0.x, v0.y, v0.z),
+                    new THREE.Vector3(v1.x, v1.y, v1.z),
+                    new THREE.Vector3(v2.x, v2.y, v2.z)
+                );
+                var i = geometry.vertices.length - 3;
+                geometry.faces.push(new THREE.Face3(i, i+1, i+2));
+            }
+        }
+    }
+    geometry.computeBoundingSphere();
+    geometry.computeFaceNormals();
+
+    return new THREE.Mesh(geometry, new THREE.MeshNormalMaterial({ wireframe : false, shading : THREE.SmoothShading }));
+};
+
+GameLib.D3.GenerateHeightmapDataFromImage = function (
+    imagePath,
+    callback    // receives HeightmapData instance as the first argument
+) {
+    var img = new Image();
+
+    img.onload = function () {
+
+        var canvas = document.createElement('canvas');
+        canvas.width = img.width;
+        canvas.height = img.height;
+
+        var context = canvas.getContext('2d');
+        context.drawImage(img, 0, 0);
+
+        var imgd = context.getImageData(0, 0, img.width, img.height);
+        var pixels = imgd.data;
+
+        var heightList = [];
+        for (var i = 0, n = pixels.length; i < n; i += (4)) {
+            heightList.push(pixels[i]);
+        }
+
+        var matrix = [];
+        var sizeX = img.width,
+            sizeY = img.height;
+
+        for (var i = 0; i < sizeX; i++) {
+            matrix.push([]);
+            for (var j = 0; j < sizeY; j++) {
+                var height = (heightList[(sizeX - i) + j * sizeY] / 255) * 15;
+                matrix[i].push(height);
+            }
+        }
+
+
+        // todo: delete canvas here
+
+        callback(new GameLib.D3.HeightmapData(sizeX, sizeY, matrix));
+    };
+
+    img.src = imagePath;
+};
+
 if (typeof module != 'undefined') {
     module.exports = GameLib.D3;
 }