In this talk, I will describe the main techniques of photographic 3D-reconstruction, which are structure-from-motion, multi-view stereoscopy, shape-from-shading and photometric stereo. I will highlight the advantages and disadvantages of each of them, and show that they can be complementary. In particular, I will discuss a work in progress between the Toulouse and Rome research groups, which concerns an original technique called "multi-view shape-from-shading".