private static Matrix4x4 CreateViewportTransform(int width, int height, float viewportScale)
{
var actualWidth = (int)(width * viewportScale);
var actualHeight = (int)(height * viewportScale);
var actualXmin = (width - actualWidth) / 2;
var actualYmin = (height - actualHeight) / 2;
var viewport = Matrix4x4Utils.Viewport(actualXmin, actualYmin, actualWidth, actualHeight);
return(viewport);
}
private static Matrix4x4 CreateProjectionTransform(bool usePerspectiveProjection, Vector3 center, Vector3 eye)
{
if (!usePerspectiveProjection)
{
return(Matrix4x4.Identity);
}
var distance = new Vector3(center.X - eye.X, center.Y - eye.Y, center.Z - eye.Z).Length();
return(Matrix4x4Utils.OrthographicProjection(distance));
}
private static Matrix4x4 CreateViewTransform(Vector3 center, Vector3 eye, Vector3 up)
{
var view = Matrix4x4Utils.LookAt(center, eye, up);
return(view);
}