public CameraItem(ScalarItem hsize, ScalarItem vsize, ScalarItem field_of_view)
{
Hsize = hsize;
Vsize = vsize;
FieldOfView = field_of_view;
Transform = new MatrixItem();
compute_parameters();
}
StackItem multiply(MatrixItem l, Vector4Item r)
{
return(new Vector4Item(
Vector4.Dot(l.GetRow(0), r.Vector4Value),
Vector4.Dot(l.GetRow(1), r.Vector4Value),
Vector4.Dot(l.GetRow(2), r.Vector4Value),
Vector4.Dot(l.GetRow(3), r.Vector4Value)));
}
StackItem multiply(MatrixItem l, RayItem r)
{
Vector4Item origin = new Vector4Item(r.Origin);
Vector4Item direction = new Vector4Item(r.Direction);
Vector4Item newOrigin = (Vector4Item)multiply(l, origin);
Vector4Item newDirection = (Vector4Item)multiply(l, direction);
return(new RayItem(newOrigin.Vector4Value, newDirection.Vector4Value));
}
public bool ApproxEqual(MatrixItem rhs, double tolerance)
{
for (int i = 0; i < 4; i++)
{
for (int j = 0; j < 4; j++)
{
if (Math.Abs(this.GetElement(i, j) - rhs.GetElement(i, j)) > tolerance)
{
return(false);
}
}
}
return(true);
}
StackItem divide(MatrixItem l, ScalarItem r)
{
return(new MatrixItem(Matrix4x4.Multiply(l.MatrixValue, 1.0f / r.FloatValue)));
}
StackItem multiply(MatrixItem l, MatrixItem r)
{
return(new MatrixItem(Matrix4x4.Multiply(l.MatrixValue, r.MatrixValue)));
}
StackItem negate(MatrixItem item)
{
return(new MatrixItem(-item.MatrixValue));
}
StackItem minus(MatrixItem l, MatrixItem r)
{
return(new MatrixItem(l.MatrixValue - r.MatrixValue));
}
StackItem plus(MatrixItem l, MatrixItem r)
{
return(new MatrixItem(l.MatrixValue + r.MatrixValue));
}
public bool IsEqual(MatrixItem rhs)
{
return(this.MatrixValue == rhs.MatrixValue);
}