Cube - set solid render good, set smooth render wierd

I’m still going off the mentality of what I learned in the basic tutorials. I have a cube and 2 lamps. The set solid render looks like I would expect. But when I hit set smooth for the cube, I get unexpected results with respect to the light reflecting off the surface of the cube, which looks wierd/wrong. Once again, I seem to be missing some fundamental piece of information. :slight_smile: Why does it look like this when set smooth is on? Is this because you just would never set smooth for a shape like this, so the algorithm breaks down?

set solid:
http://home.comcast.net/~Yasoo2/Misc/cube3.jpg

set smooth:
http://home.comcast.net/~Yasoo2/Misc/cube4.jpg

My guess would be that the smoothing is like phong smoothing, meaning the “faces” smooth, but the edges, as compared to the rest of the scene retain their true form.

Just a guess… but I’d bet it’s close to the truth.

Try subdividing your cube a few times and see what happens. I’ve had the same problem before when I set cylinders smooth.

set smooth is supposed to be used on like spheres and stuff, not cubes. it is supposed to give the sphere a more smooth look like a normal sphere should instead of you seeing all the polys that make it up (try set smooth on a sphere, you will see…). is you make a cylindar with 25 sides or so and click set smooth , then click the auto smooth button it will smooth it so it looks like a pipe…(try it, you will see). this option shouldnt be used on a cube, basically what it does is makes light reflect evenly throughout all the faces and not be cutoff by the sided … hope this made sence. it just makes stuff look really smooth

Thanks for the tip about the cylinder frig, I couldn’t figure out for the life of me why I couldn’t get my cylinders to work right. :smiley: