/// <summary>
/// <para>Rotates all vertices in the mesh, from the origin, by the given rotation vector in degrees.</para>
/// <para>This is useful for rotating an object before placing it in a ShapeGroup.</para>
/// For camera rotation, use RotateCamera(rotationVector).
/// </summary>
public void RotateVerticesAboutOrigin(Vector3 rotationVectorDegrees)
{
foreach (var face in Faces)
{
for (var i = 0; i < face.VerticeCount; i++)
{
face.Composition[i].Position =
Vector3.Transform(
face.Composition[i].Position,
Quaternion.CreateFromAxisAngle(new Vector3(1, 0, 0), (float)rotationVectorDegrees.X.ToRadians()));
face.Composition[i].Position =
Vector3.Transform(
face.Composition[i].Position,
Quaternion.CreateFromAxisAngle(new Vector3(0, 1, 0), (float)rotationVectorDegrees.Y.ToRadians()));
face.Composition[i].Position =
Vector3.Transform(
face.Composition[i].Position,
Quaternion.CreateFromAxisAngle(new Vector3(0, 0, 1), (float)rotationVectorDegrees.Z.ToRadians()));
if ((i + 1) % 3 == 0 && i != face.VerticeCount - 1)
{
var newNormal = ShapeHelpers.GetNormal(
face.Composition[i].Position,
face.Composition[i + 1].Position,
face.Composition[i + 2].Position);
face.Composition[i].Normal = newNormal;
face.Composition[i + 1].Normal = newNormal;
face.Composition[i + 2].Normal = newNormal;
}
}
}
}
public FaceTriangle(
Vector3 top,
Vector3 bottomLeft,
Vector3 bottomRight)
{
VerticeCount = 3;
PolygonCount = 1;
Composition = new VertexPositionNormalTexture[VerticeCount];
var normal = ShapeHelpers.GetNormal(top, bottomLeft, bottomRight);
Composition[0] = new VertexPositionNormalTexture(top, normal, new Vector2(0.5f, 0));
Composition[1] = new VertexPositionNormalTexture(bottomLeft, normal, new Vector2(0, 1));
Composition[2] = new VertexPositionNormalTexture(bottomRight, normal, new Vector2(1, 1));
}
public FaceSquare(
Vector3 topLeft,
Vector3 topRight,
Vector3 bottomLeft,
Vector3 bottomRight)
{
VerticeCount = 6;
PolygonCount = 2;
Composition = new VertexPositionNormalTexture[VerticeCount];
var normal = ShapeHelpers.GetNormal(topLeft, topRight, bottomLeft);
// Squares are made of two triangles. This makes it easier to process
Composition[0] = new VertexPositionNormalTexture(topLeft, normal, new Vector2(0, 0));
Composition[1] = new VertexPositionNormalTexture(topRight, normal, new Vector2(1, 0));
Composition[2] = new VertexPositionNormalTexture(bottomLeft, normal, new Vector2(0, 1));
normal = ShapeHelpers.GetNormal(bottomLeft, topRight, bottomRight);
Composition[3] = new VertexPositionNormalTexture(bottomLeft, normal, new Vector2(0, 1));
Composition[4] = new VertexPositionNormalTexture(topRight, normal, new Vector2(1, 0));
Composition[5] = new VertexPositionNormalTexture(bottomRight, normal, new Vector2(1, 1));
}