bool ParseNode(Mat4 nodeTransform, XmlNode node)
{
string nodeId = XmlUtils.GetAttribute(node, "id");
Mat4 currentTransform = nodeTransform;
foreach (XmlNode childNode in node.ChildNodes)
{
if (childNode.Name == "matrix")
{
float[] values = ConvertStringToFloatArray(childNode.InnerText);
if (values == null || values.Length != 16)
{
Error("Invalid format of \"matrix\" node. Node \"{0}\".", nodeId);
return(false);
}
Mat4 matrix = new Mat4(values);
currentTransform *= matrix;
continue;
}
if (childNode.Name == "translate")
{
float[] values = ConvertStringToFloatArray(childNode.InnerText);
if (values == null || values.Length != 3)
{
Error("Invalid format of \"translate\" node. Node \"{0}\".", nodeId);
return(false);
}
Vec3 translate = new Vec3(values[0], values[1], values[2]);
currentTransform *= Mat4.FromTranslate(translate);
continue;
}
if (childNode.Name == "rotate")
{
float[] values = ConvertStringToFloatArray(childNode.InnerText);
if (values == null || values.Length != 4)
{
Error("Invalid format of \"rotate\" node. Node \"{0}\".", nodeId);
return(false);
}
Vec3 axis = new Vec3(values[0], values[1], values[2]);
Radian angle = new Degree(values[3]).InRadians();
if (axis != Vec3.Zero)
{
axis.Normalize();
float halfAngle = .5f * angle;
float sin = MathFunctions.Sin(halfAngle);
float cos = MathFunctions.Cos(halfAngle);
Quat r = new Quat(axis * sin, cos);
r.Normalize();
currentTransform *= r.ToMat3().ToMat4();
}
continue;
}
if (childNode.Name == "scale")
{
float[] values = ConvertStringToFloatArray(childNode.InnerText);
if (values == null || values.Length != 3)
{
Error("Invalid format of \"scale\" node. Node \"{0}\".", nodeId);
return(false);
}
Vec3 scale = new Vec3(values[0], values[1], values[2]);
currentTransform *= Mat3.FromScale(scale).ToMat4();
continue;
}
if (childNode.Name == "node")
{
if (!ParseNode(currentTransform, childNode))
{
return(false);
}
continue;
}
if (childNode.Name == "instance_geometry")
{
if (!ParseNodeInstanceGeometry(currentTransform, childNode))
{
return(false);
}
continue;
}
}
return(true);
}
