This is an introductory project to GSLS (GL Shading Language). Isosurfaces are like the contours on a map except for they are 3D surfaces rather than lines. Contours consist of points on the same height in a terrain. Isosurfaces consist of points that have the same density (intensity) in a 3D image. Here, by a 3D image we mean a 3D array of '3D pixels' (called voxels).