public void LocalTransformTest()
{
var m4 = new Matrix4(1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16);
var m4x4 = (MatrixFloat4x4)m4;
using (var obj = new MDLTransform()) {
var component = (IMDLTransformComponent)obj;
// identity
Asserts.AreEqual(Matrix4.Identity, component.GetLocalTransform(0), "Initial identity");
Asserts.AreEqual(MatrixFloat4x4.Identity, component.GetLocalTransform4x4(0), "Initial identity 4x4");
Asserts.AreEqual(MatrixFloat4x4.Identity, CFunctions.MDLTransformComponent_GetLocalTransform(component, 0), "Initial identity native");
// translate the transform somewhere
obj.SetTranslation(new Vector3(2, 2, 2), 0);
// the local transform should now be a translation matrix like this:
// 1 0 0 0 2
// 0 1 0 0 2
// 0 0 1 0 2
// 0 0 0 1 0
// but since Matrix4 is transposed when compared to MatrixFloat4x4, we get this:
Asserts.AreEqual(new Matrix4(
1, 0, 0, 0,
0, 1, 0, 0,
0, 0, 1, 0,
2, 2, 2, 1
), component.GetLocalTransform(0), "Translated");
// The 4x4 version is correct:
Asserts.AreEqual(new Matrix4(
1, 0, 0, 2,
0, 1, 0, 2,
0, 0, 1, 2,
0, 0, 0, 1
), component.GetLocalTransform4x4(0), "Translated 4x4");
// Let's set the local transform at time 1 to something (different from the identity matrix)
component.SetLocalTransform(m4, 1);
// At time 1 the transform matrix is now the identity matrix
Asserts.AreEqual(Matrix4.Identity, component.GetLocalTransform(1), "After SetLocalTransform at 1");
// At time 0.5 we get a middle ground
Asserts.AreEqual(new Matrix4(
1, 0, 0, 0,
0, 1, 0, 0,
0, 0, 1, 0,
1, 1, 1, 1
), component.GetLocalTransform(0.5), 0.00001f, "AfterSetLocalTransform at 0.5");
// And at time 0 we still have the translated matrix.
Asserts.AreEqual(new Matrix4(
1, 0, 0, 0,
0, 1, 0, 0,
0, 0, 1, 0,
2, 2, 2, 1
), component.GetLocalTransform(0), 0.00001f, "AfterSetLocalTransform at 0");
// Let's set the local transform at all times
component.SetLocalTransform(m4);
// And we get the identity matrix back at all times
Asserts.AreEqual(Matrix4.Identity, component.GetLocalTransform(0), "Second identity at 0");
Asserts.AreEqual(Matrix4.Identity, component.GetLocalTransform(1), "Second identity at 1");
// Translate again
obj.SetTranslation(new Vector3(3, 3, 3), 0);
// Set the local transform using a 4x4 matrix
component.SetLocalTransform4x4(m4x4, 1);
// And at time 0.5 we still get a middle ground
// The numbers are different now because the translation matrix was different,
// and the matrix is correct because we're checking the 4x4 version.
Asserts.AreEqual(new MatrixFloat4x4(
1, 0, 0, 1.5f,
0, 1, 0, 1.5f,
0, 0, 1, 1.5f,
0, 0, 0, 1
), component.GetLocalTransform4x4(0.5), 0.00001f, "AfterSetLocalTransform4x4 at 0.5");
}
}