Barycentric Coordinates and Point in Triangle Tests

re: Barycentric Coordinates and Point in Triangle Tests

Reza Nourai - MSFT — Mon, 05 Sep 2011 19:38:06 GMT

Hi Vektor, I think my last reply got lost so I'll reply again.

You're absolutely right. You pointed out a pretty big oversight on my part and I've corrected the blog to reflect the right solution. Since we are taking the norm of the equation, the signs of r and t got lost, so checking for > 0 at the end was meaningless. I've corrected it to determine the signs earlier before taking the norm, with an explanation of how we do that.

Thanks for catching that!

re: Barycentric Coordinates and Point in Triangle Tests

vektor — Mon, 05 Sep 2011 07:16:28 GMT

Hi,

Nice post. But I have a question. According to your post, it appears that r and t never go below 0 because you are only working with vector lengths. Ideally, when we test a point outside the triangle, either or both the values of r and t must be < 0.

re: Barycentric Coordinates and Point in Triangle Tests

BakerCo — Fri, 12 Aug 2011 22:54:48 GMT

Thanks a lot your blog is very helpful to me please keep it up I am looking forward to the physics stuff. Thanks again

BakerCo