Properties of the revolute object

[actarus1]

hi all~

I want to knwo that, if using draw>b-spline to draw a line, then revolute it about an axis, what's the properties of this revolute object? is it a polygon? and, from many games article, they said that a POLYGON object, maybe a polygon character or a polygon car, is relate to "a number of triangles" inside it, then when I get a cube from the primitive menu, the cube don'y have any triangles on its surface?? maybe my idea about polygon is wrong, but I wish you can correct me if I really wrong, and solve my problem~

Solution Hong

[fredc]

When you revolve it has options to choose what kind of geometry you want. The choices are Polygons, B-Spline patches, or NURBS.

Note: When you create a surface of revolution with B-Splines or NURBS they are usually very dense in polyons. You can reduce this easily with Info/Selection the reduce the step value. Often it is at 10, but 3 is often sufficient.

You can't reduce the step value if you have modeling relations On. So copy the surface or delete the curve before you reduce step values, or they will be changed back the next time the curve is modified.

Hope this helps,
Urp

[pomme]

I think triangles is different than polygons. I am not sure. but 1 polygon is made up with 4 CVs. And, triangles is the break down of the surfaces when rendering. You know what i mean? When you render. The render engine will translate your surfaces into numbers of triangles no matter it is a nurbs poly or a patch. Nurbs. as Urp said, the steps will affect the numbers of triangles. Polygon, I think 1 polygon means 2 triangles. since poly is made up of 4 points. Patch. one patch itself is made up of triangles.

This is what i think sould be. But there has no one tells me the definision of triangles. Someone can proof me wrong. I want to know the answer too.

[fredc]

On Info/Selection you will see a value for polygons and triangles. Yes, triangles should reflect the tiling for rendering. Polygons can very. For instance a 5 sided polygon will need to be broken up into more triangles than a rectangular polygon.

Urp