Description
The TransformNormal method is used to transform a normal vector by a matrix. This method is particularly useful when you need to apply a transformation to a normal vector, such as when transforming normals for lighting calculations in 3D graphics.
Unlike transforming a position vector, transforming a normal vector does not involve translation components of the matrix. This method ensures that the normal vector is correctly transformed by only considering the rotational and scaling components of the matrix.
Usage
To use the TransformNormal method, you need an instance of a Matrix and a Vector3 representing the normal vector you wish to transform. Call the method on the matrix instance, passing the normal vector as a parameter. The method returns a new Vector3 that represents the transformed normal.
Example
// Example of using TransformNormal
Matrix transformationMatrix = Matrix.CreateRotationY(45.0f);
Vector3 normal = new Vector3(0, 1, 0);
// Transform the normal vector using the matrix
Vector3 transformedNormal = transformationMatrix.TransformNormal(normal);
// Output the transformed normal
// transformedNormal now contains the rotated normal vector
