Top "Picking" questions

Threejs: assign different colors to each vertex in a geometry

I want to do picking via IdMapping in Three.js Because of performance issues I only have one huge geometry, …

javascript webgl three.js picking

Implementing Ray Picking

I have a renderer using directx and openGL, and a 3d scene. The viewport and the window are of the …

math opengl geometry directx picking

OpenGL GL_SELECT or manual collision detection?

As seen in the image I draw set of contours (polygons) as GL_LINE_STRIP. Now I want to select …

opengl 3d geometry collision-detection picking

Given a 4x4 homogeneous matrix, how can i get 3D world coords?

So i have an object which is getting rotated then translated and rotated again. I am storing a matrix of …

opengl 3d matrix geometry picking