So I’ve just downloaded Rhino and am playing with it for the first time. Coming from the world of ACAD LT. Would like to produce CAD drawings with some 3D elements to them.
We do a lot of surveys of roadways (edges of pavement, sidewalks, center lines, etc). We shoot edges of pavement and will identify which shots represent points of tangency. However, most CAD programs don’t automatically draw these curves to our satisfaction, so we hand-draw them the way we feel is representative of the real-world road.
So… Surveyed section of roadway has Points A to B which are on a straightaway, B is a PT and leads into a curve of points B, C, and D. In LT, while drawing this curve, I will place a control (non-surveyed) point about 95% of the way towards Point B. Call it A2. This keeps the A-A2-B portion straight while allowing B-C-D to curve properly. This only works because this curve is being drawn with all points set to elevation 0.00.
In Rhino, a curve drawn goes through points at their true elevation (what I want). But creating my A2 to aid in keeping the A-B portion straight doesn’t work because A2 is created at an elevation of 0.00 while Points A and B might be at 100.00. From the top view, it looks incorrect (loopy), even though it really isn’t.
Is there a way to create a new point some distance between two existing points on a curve and have it inherit an interpolated elevation? Or is there some way to give the points a sort of “bezier corner” property? In 3DS Max, using the Refine tool can modify a spline in such a way.
Thanks much. Looking forward to learning Rhino.