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In Rhino 4.0 Essential Training, author Dave Schultze shows how the 3D NURBS-based modeling tools in Rhino 4.0 are used to engineer products from toy robots to full-sized aircraft. This course concentrates on using Rhino 4.0 for industrial design and rapid prototyping, with a review of common 3D terminology using specific examples. Along with a comprehensive exploration of the Rhino interface, the course includes an introduction to building 3D objects with Rhino's three primary entities: the curve, the surface, and the solid. Exercise files are included with the course.
Next up, we'll review the third of Rhino's modeling aids, in order of location on the interface, caller Planar. It's important to remember that all geometry is created on the construction plane, unless you are snapping to another entity. So, what happens if you need to draw off the construction plane and there is nothing to snap to? Well that's when you use the Planar modeling aid or snap. Let me show you where it's located first. It's right here along the bottom, labeled Planar, and when you click it once it bolds to mean it's on and since it's a toggle, you click it again to turn it off.
I'm going to go ahead and leave that off just for this first part of the demo. I'll maximize Perspective viewport, by a double-click, and we're going to draw a short line segment. We'll use the Polyline command. I'm going to go ahead and do one more setting here. Going to Osnap and just give it somewhere to connect to, one of the end points. Okay. So, I'm going to snap to the corner of the robot's head, just going to draw a short distance, and click. So, it looks like everything worked fine, except with Planar off and nothing to snap to.
You'll note that it goes way back in the distance to the nearest construction plane point it could find. That's not what we wanted. Just go ahead and delete that. I'm going to turn Planar back on, repeat the Polyline command, snap to the corner, and now I'm forced to the same exact height of wherever I started. So, the Planar snap is very handy in situations where you need to draw elements off of the construction plane, but it's definitely the least used of the four modeling aids.
More often, you might find it easier to draw or build geometry directly on the construction plane where you have more control and can use the grid and then move the finished geometry to its final location. Alternatively, if you're going to be doing extensive work, then you'd want to move the construction plane up to the level it is needed and avoid using Planar all together.
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