public static Matrix <float> GetViewMatrix(Vector <float> cameraPos, Vector <float> frontPosition,
Vector <float> upPosition)
{
var targetDirection = (cameraPos - frontPosition)
.Normalize(1);
var cameraRight = upPosition.CrossProduct(targetDirection)
.Normalize(1);
var cameraUp = targetDirection.CrossProduct(cameraRight)
.Normalize(1);
var lookAt = Matrix <float> .Build.Dense(4, 4);
lookAt.SetRow(0, cameraRight.AddValueToEnd(0));
lookAt.SetRow(1, cameraUp.AddValueToEnd(0));
lookAt.SetRow(2, targetDirection.AddValueToEnd(0));
lookAt.SetRow(3, new[] { 0f, 0f, 0f, 1f });
var identityMatrix = GetIdentityMatrix(4, 4);
identityMatrix.SetColumn(3, -cameraPos.AddValueToEnd(1));
identityMatrix[3, 3] = 1f;
return(lookAt * identityMatrix);
}
