This tutorial is intended to work as a student centered learning resource. It will introduce you to the basics of creating 3D models of your building designs using AutoCAD. Use the AutoCAD help menu system as required. You will be familiar with working in 2D (two dimensions). As you may have already found, this can be quite limiting. You are representing 3D objects in a 2D format, which has then to be interpreted in order to visualise in 3D. Working with a 3D model has many advantages over 2D representations, including:
• Ease of visualising from any view point.
• Ease of creating 2D draughting views.
• Creation of photo-realistic images, animations and virtual reality presentations.
• Use of geometry for computational analysis, e.g. FEA.
• Use of geometry for CNC manufacturing processes.
Drawing in 3D is essentially the same as drawing in 2D. The same commands work in the same way. The only difference is that you use the z component in the Cartesian coordinate system along with the x and y components. So the origin would be: <0,0,0> In 2D CAD there is only one plane on which you create your drawing, so any ‘selecting click’ with the cursor or pointer will automatically pick off that plane. In 3D there are an infinite number of possible planes, so the situation becomes much more complicated. The secret to easy and efficient modelling in 3D, whatever software you use, is how you use the tools available to specify a point or position in space when editing a 3D entity.
source : www.tech.plym.ac.uk
Tags : cartesian coordinate system, autocad help, realistic images, computational analysis, visualising, 3d models, 3d objects, 3d model, menu system, infinite number, virtual reality, help menu, use of geometry, cursor, pointer
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