/// <summary>
/// Computes the bounding box for the specified xna model.
/// </summary>
public static BoundingBox ComputeBoundingBox(this Microsoft.Xna.Framework.Graphics.Model model)
{
ModelTag extensions = model.Tag as ModelTag;
// Try to use collision tree.
if (extensions != null && extensions.Collision != null)
{
return(extensions.Collision.CollisionTree.Bounds);
}
// Try to use vertices of the mesh
BoundingBox result = new BoundingBox();
#if !SILVERLIGHT
if (ComputeBoundingBoxFromVertices(model, out result))
{
return(result);
}
#endif
// Now use bounding spheres
foreach (var mesh in model.Meshes)
{
BoundingBox box = BoundingBox.CreateFromSphere(
mesh.BoundingSphere.Transform(GetAbsoluteTransform(mesh, Matrix.Identity)));
result = BoundingBox.CreateMerged(result, box);
}
return(result);
}
/// <summary>
/// Gets the nearest intersection point from the specifed picking ray.
/// </summary>
/// <returns>Distance to the start of the ray.</returns>
public static float?Intersects(this Microsoft.Xna.Framework.Graphics.Model model, Matrix world, Ray ray)
{
Ray local;
ModelTag extensions = model.Tag as ModelTag;
// Collision tree not found, use bounding sphere instead.
if (extensions == null || extensions.Collision == null)
{
float?result = null;
foreach (var mesh in model.Meshes)
{
local = ray.Transform(Matrix.Invert(GetAbsoluteTransform(mesh, world)));
float?current = mesh.BoundingSphere.Intersects(local);
if (result == null)
{
result = current;
}
else if (current.HasValue && current.Value < result.Value)
{
result = current.Value;
}
}
return(result);
}
// Detect using collision tree.
local = ray.Transform(Matrix.Invert(GetAbsoluteTransform(model.Meshes[0], world)));
return(extensions.Collision.Intersects(local));
}
/// <summary>
/// Gets the animation data associated with the specified model.
/// Works with models that are processed by Nine.Pipeline.Processors.ExtendedModelProcessor.
/// </summary>
public static ICollection <string> GetAnimations(this Microsoft.Xna.Framework.Graphics.Model model)
{
ModelTag extensions = model.Tag as ModelTag;
if (extensions != null && extensions.Animations != null)
{
return(extensions.Animations.Keys);
}
return(EmptyStringCollection);
}
/// <summary>
/// Gets the animation data associated with the specified model.
/// Works with models that are processed by Nine.Pipeline.Processors.ExtendedModelProcessor.
/// </summary>
public static BoneAnimationClip GetAnimation(this Microsoft.Xna.Framework.Graphics.Model model, string name)
{
ModelTag extensions = model.Tag as ModelTag;
if (extensions != null && extensions.Animations != null)
{
BoneAnimationClip clip = null;
extensions.Animations.TryGetValue(name, out clip);
return(clip);
}
return(null);
}
/// <summary>
/// Gets the animation data associated with the specified model.
/// Works with models that are processed by Nine.Pipeline.Processors.ExtendedModelProcessor.
/// </summary>
public static BoneAnimationClip GetAnimation(this Microsoft.Xna.Framework.Graphics.Model model, int index)
{
BoneAnimationClip clip = null;
ModelTag extensions = model.Tag as ModelTag;
if (extensions != null && extensions.Animations != null &&
extensions.Animations.Count > 0)
{
foreach (string key in extensions.Animations.Keys)
{
if (index-- == 0)
{
extensions.Animations.TryGetValue(key, out clip);
break;
}
}
}
return(clip);
}
/// <summary>
/// Gets wether the model contains the given point.
/// </summary>
public static bool Contains(this Microsoft.Xna.Framework.Graphics.Model model, Matrix world, Vector3 point)
{
Vector3 local;
ModelTag extensions = model.Tag as ModelTag;
// Collision tree not found, use bounding sphere instead.
if (extensions == null || extensions.Collision == null)
{
foreach (var mesh in model.Meshes)
{
local = point - GetAbsoluteTransform(mesh, world).Translation;
if (mesh.BoundingSphere.Contains(local) == ContainmentType.Contains)
{
return(true);
}
}
return(false);
}
// Detect using collision tree.
local = point - GetAbsoluteTransform(model.Meshes[0], world).Translation;
return(extensions.Collision.Contains(local));
}
internal static ModelSkeletonData GetSkeletonData(this Microsoft.Xna.Framework.Graphics.Model model)
{
ModelTag extensions = model.Tag as ModelTag;
return(extensions != null ? extensions.Skeleton : null);
}
/// <summary>
/// Gets whether the specified model has any skinning info attached to it.
/// Works with models that are processed by Nine.Pipeline.Processors.ExtendedModelProcessor.
/// </summary>
public static bool IsSkinned(this Microsoft.Xna.Framework.Graphics.Model model)
{
ModelTag extensions = model.Tag as ModelTag;
return(extensions != null && extensions.Skeleton != null);
}
