Problem using Eigen math library with opengl

Question

Hi everybody, I'm currently trying to use Eigen math library with Opengl. I've some typedefs for Vector3f from Eigen, say Vec3, so that I can use it as a coord for my vertices. I also have a structure for a vertex with coord (vec3), normal (vec3) and color(vec4). When I try to use vertex arrays (I'll use VBOs once I make vertex arrays work properly) it seems there is a problem with OpenGL processing Eigen's Vector3f as coords... Has any of you dealed with these issues??

Thanks in advance.

Answer 1

In Eigen, Vectors are Matrices (cf http://bitbucket.org/eigen/eigen/src/e17630a40408/doc/AsciiQuickReference.txt line 12)

I suspect Matrices to own not only the data, but only additional information, like its size. What's more, it packing may be weird.

So, what does sizeof(Eigen::Vector3f) returns ? If it's 3xsizeof(float) = 12, the problem is elsewhere.

How do you setup and draw your array, by the way ?