Sign Up to our social questions and Answers Engine to ask questions, answer people’s questions, and connect with other people.
Login to our social questions & Answers Engine to ask questions answer people’s questions & connect with other people.
Lost your password? Please enter your email address. You will receive a link and will create a new password via email.
Please briefly explain why you feel this question should be reported.
Please briefly explain why you feel this answer should be reported.
Please briefly explain why you feel this user should be reported.
I would like to compute the intersection of a 3D line with the plane at infinity. I suspect it would be the same as taking the 3D direction of the line and setting the 4th vector coordinate to 0.
However, this is not enough. I would like to know the 2D position of the intersection in screen coordinates after the line is transformed and projected by a perspective camera.
This problem is equivalent to finding the vanishing point in a 2D image.
It seems that a vanishing point corresponds to a direction in 3D space. Hence, using a homogeneous vector of the form [x y z 0] in the rendering pipeline yields the 2D coordinates of the vanishing point on the screen.