c# - XNA 3D 碰撞矩阵不起作用

Question

我之前问过一个问题，为什么我的碰撞不起作用。我得到了一个很好的答案，这是有道理的:将我在 DrawModel 方法中所做的相同转换应用于 isCollision 方法。然而，这并没有奏效。我无法弄清楚如何在 isCollision 方法中进行相同的转换。如果有人能帮助我，那就太好了。谢谢!方法如下:

private bool checkPlayerCollision(Model model1, Matrix world1)
{
    //Make floor matrix
    Matrix floorMatrix = Matrix.CreateTranslation(new Vector3(0, 0, 0));
    //Make ship1 matrix
    Matrix ship1WorldMatrix = Matrix.CreateTranslation(ship1loc);
    //Make ship2 matrix
    Matrix ship2WorldMatrix = Matrix.CreateTranslation(ship2loc);
    //Check for collision with floor
    if (IsCollision(model1, world1, floor, floorMatrix)) return true;
    //Check for collision with ship1
    if (IsCollision(model1, world1, model, ship1WorldMatrix)) return true;
    //Check for collision with ship2
    if (IsCollision(model1, world1, model, ship2WorldMatrix)) return true;
    return false;
}

这是检查玩家碰撞，我检查所有模型是否与玩家模型发生碰撞。

private bool IsCollision(Model model1, Matrix world1, Model model2, Matrix world2)
{
    for (int meshIndex1 = 0; meshIndex1 < model1.Meshes.Count; meshIndex1++)
    {
        BoundingSphere sphere1 = model1.Meshes[meshIndex1].BoundingSphere;
        sphere1 = sphere1.Transform(world1);

        for (int meshIndex2 = 0; meshIndex2 < model2.Meshes.Count; meshIndex2++)
        {
            BoundingSphere sphere2 = model2.Meshes[meshIndex2].BoundingSphere;
            sphere2 = sphere2.Transform(world2);

            if (sphere1.Intersects(sphere2))
                return true;
        }
    }
    return false;
}

这就是我实际检查碰撞的方法。

private void DrawModel(Model model, Matrix world, Matrix view, Matrix projection, Vector3 loc)
{
    Matrix gameWorldRotation = Matrix.CreateRotationX(MathHelper.ToRadians(RotationX)) * Matrix.CreateRotationY(MathHelper.ToRadians(RotationY));
    Matrix[] transforms = new Matrix[model.Bones.Count];
    model.CopyAbsoluteBoneTransformsTo(transforms);
    foreach (ModelMesh mesh in model.Meshes)
    {
        foreach (BasicEffect effect in mesh.Effects)
        {
            effect.World = gameWorldRotation * transforms[mesh.ParentBone.Index] * Matrix.CreateTranslation(loc);
            GraphicsDevice.RenderState.DepthBufferEnable = true;
            effect.EnableDefaultLighting();

            //effect.World = world;
            effect.View = view;
            effect.Projection = projection;
        }

        mesh.Draw();
    }
}

这就是我绘制模型并进行矩阵变换的方法。 可根据要求提供更多代码以及更多信息。

Answer 1

I was unable to figure out how to make the same transformations in the isCollision method. If anyone could help me, that would be great

在应用任何移动或旋转后，您可以通过在 Update 方法中构建变换矩阵来实现此目的。然后保存构建的矩阵并将其传递给碰撞测试方法和绘制方法。

Matrix TransformationMatrix;   
void Update()
        {
        TransformationMatrix = Matrix.Create...X(RotationX) * Matrix.Create...Y(RotationY) * transforms[mesh.ParentBone.Index] * Matrix.CreateTranslation(loc);
        }

然后

(IsCollision(TransformationMatrix )
{
sphere.Transform(TransformationMatrix );
} 

和

DrawModel(TransformationMatrix )
{
 effect.World = TransformationMatrix ;
}