我正在 XNA 中实现 Kinect 应用程序。
我是 3D 编程的新手，我想知道如何从圆柱体模型中检索半径或高度等参数，以便在其周围创建一个边界框以进行碰撞检测。
我的问题是我的圆柱体的位置和角度与 Kinect 场中玩家前臂的位置同步，所以我不知道如何定义边界框参数（中心最小值或最大值...... ）。
这是我的边界框创建方法的代码：
private BoundingBox CalculateBoundingBox(Model model, Matrix worldTransform)
{
// Initialize minimum and maximum corners of the bounding box to max and min values
Vector3 min = new Vector3(float.MaxValue, float.MaxValue, float.MaxValue);
Vector3 max = new Vector3(float.MinValue, float.MinValue, float.MinValue);
// For each mesh of the model
foreach (ModelMesh mesh in model.Meshes)
{
foreach (ModelMeshPart meshPart in mesh.MeshParts)
{
// Vertex buffer parameters
int vertexStride = meshPart.VertexBuffer.VertexDeclaration.VertexStride;
int vertexBufferSize = meshPart.NumVertices * vertexStride;
// Get vertex data as float
float[] vertexData = new float[vertexBufferSize / sizeof(float)];
meshPart.VertexBuffer.GetData<float>(vertexData);
// Iterate through vertices (possibly) growing bounding box, all calculations are done in world space
for (int i = 0; i < vertexBufferSize / sizeof(float); i += vertexStride / sizeof(float))
{
Vector3 transformedPosition = Vector3.Transform(new Vector3(vertexData[i], vertexData[i + 1], vertexData[i + 2]), worldTransform);
min = Vector3.Min(min, transformedPosition);
max = Vector3.Max(max, transformedPosition);
}
}
}
// Create and return bounding box
return new BoundingBox(min, max);
}
这是我的碰撞检测方法的代码
private bool isCollisionDetected(Model m1, Model m2)
{
bool detection;
BoundingBox b1 = CalculateBoundingBox(m1);
BoundingBox b2 = CalculateBoundingBox(m2);
if (b1.Intersects(b2))
{
detection = true;
}
else
{
detection = false;
}
return detection;
}