/*
* Copyright 2003-2006, 2009, 2017, United States Government, as represented by the Administrator of the
* National Aeronautics and Space Administration. All rights reserved.
*
* The NASAWorldWind/WebWorldWind platform is licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
/**
* @exports ColladaNode
*/
define(['./ColladaUtils', '../../geom/Matrix', '../../geom/Vec3'], function (ColladaUtils, Matrix, Vec3) {
"use strict";
/**
* Constructs a ColladaNode
* @alias ColladaNode
* @constructor
* @classdesc Represents a collada node tag.
*/
var ColladaNode = function () {
this.id = "";
this.name = "";
this.sid = "";
this.children = [];
this.materials = [];
this.mesh = "";
this.localMatrix = Matrix.fromIdentity();
this.worldMatrix = Matrix.fromIdentity();
};
/**
* Parses a visual_scene node.
* Internal. Applications should not call this function.
* @param {Node} element A visual_scene node.
* @param {NodeList} iNodes Nodes from library_nodes.
* @param {Matrix} parentWorldMatrix The transformation matrix of it's parent.
*/
ColladaNode.prototype.parse = function (element, iNodes, parentWorldMatrix) {
this.id = element.getAttribute('id');
this.sid = element.getAttribute('sid');
this.name = element.getAttribute('name');
this.children = [];
this.materials = [];
this.mesh = "";
this.localMatrix = Matrix.fromIdentity();
this.worldMatrix = Matrix.fromIdentity();
this.setNodeTransforms(element, parentWorldMatrix);
for (var i = 0; i < element.childNodes.length; i++) {
var child = element.childNodes[i];
if (child.nodeType !== 1) {
continue;
}
switch (child.nodeName) {
case 'node':
this.children.push(( new ColladaNode() ).parse(child, iNodes, this.worldMatrix));
break;
case 'instance_geometry':
this.mesh = child.getAttribute("url").substr(1);
var materials = child.querySelectorAll("instance_material");
for (var j = 0; j < materials.length; j++) {
var material = materials.item(j);
this.materials.push({
id: material.getAttribute("target").substr(1),
symbol: material.getAttribute("symbol")
});
}
break;
case 'instance_node':
var iNodeId = child.getAttribute('url').substr(1);
var iNode = this.getLibraryNode(iNodes, iNodeId);
if (iNode) {
this.children.push(( new ColladaNode() ).parse(iNode, iNodes, this.worldMatrix));
}
break;
default:
break;
}
}
return this;
};
/**
* Computes the transformation and normal matrix of a node
* Internal. Applications should not call this function.
* @param {Node} element A visual_scene node.
* @param {Matrix} parentWorldMatrix The transformation matrix of it's parent.
*/
ColladaNode.prototype.setNodeTransforms = function (element, parentWorldMatrix) {
var matrix = Matrix.fromIdentity(),
rotationMatrix = Matrix.fromIdentity(),
translationMatrix = Matrix.fromIdentity(),
scaleMatrix = Matrix.fromIdentity();
if (!parentWorldMatrix) {
parentWorldMatrix = Matrix.fromIdentity();
}
var transforms = [];
for (var i = 0; i < element.childNodes.length; i++) {
var child = element.childNodes[i];
if (child.nodeType !== 1) {
continue;
}
switch (child.nodeName) {
case 'matrix':
var values = ColladaUtils.bufferDataFloat32(child);
matrix.copy(values);
transforms.push(matrix);
break;
case 'rotate':
values = ColladaUtils.bufferDataFloat32(child);
rotationMatrix.multiplyByRotation(values[0], values[1], values[2], values[3]);
transforms.push(rotationMatrix);
break;
case 'translate':
values = ColladaUtils.bufferDataFloat32(child);
translationMatrix.multiplyByTranslation(values[0], values[1], values[2]);
transforms.push(translationMatrix);
break;
case 'scale':
values = ColladaUtils.bufferDataFloat32(child);
scaleMatrix.multiplyByScale(values[0], values[1], values[2]);
transforms.push(scaleMatrix);
break;
default:
break;
}
}
for (i = 0; i < transforms.length; i++) {
this.localMatrix.multiplyMatrix(transforms[i]);
}
this.worldMatrix.setToMultiply(parentWorldMatrix, this.localMatrix);
this.normalMatrix = Matrix.fromIdentity();
var rotationAngles = new Vec3(0,0,0);
this.worldMatrix.extractRotationAngles(rotationAngles);
this.normalMatrix.multiplyByRotation(-1, 0, 0, rotationAngles[0]);
this.normalMatrix.multiplyByRotation(0, -1, 0, rotationAngles[1]);
this.normalMatrix.multiplyByRotation(0, 0, -1, rotationAngles[2]);
};
/**
* Retrieves a node form library_nodes
* Internal. Applications should not call this function.
* @param {NodeList} iNodes Nodes from library_nodes
* @param {String} id The id of the node to retrieve
*/
ColladaNode.prototype.getLibraryNode = function (iNodes, id) {
for (var i = 0; i < iNodes.length; i++) {
var attObj = iNodes[i].attributes.getNamedItem('id');
if (attObj && attObj.value === id) {
return iNodes[i];
}
}
return null;
};
return ColladaNode;
});