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In this lesson you will learn how to use AutoCAD's Dynamic UCS mode to conveniently draw objects on the surfaces of other objects. Open the Concept 4 project file, and then go down to the Status bar and click this icon to allow Dynamic UCS. Then draw an object. Click the Rectangle tool on the Draw panel. Position the cursor over this wall, and notice that the axes change so that the red and green axes are now oriented with respect to this surface.
Click two points to draw a rectangle, and then orbit by holding down Shift and dragging the mouse wheel. And you'll see that the rectangle is indeed on that surface. Zoom into this pyramid, click the Circle tool, hover the cursor over this surface, and click two points. You'll see that the circle is flush with that face. So Dynamic UCS really does two things. It moves the origin point of the UCS to the surface, and it also reorients the UCS to be aligned with the surface.
This also works in 3D. Let's change to the 3D Basics Workspace. And then create a box off to the side here some place. Place another box on top ot it, simply by drawing it on top of the surface. If you want a box to come off of the side, you can just start drawing it there. So this is very intuitive, and it's great for conceptual modeling.
So in this lesson, you learned how to enable Dynamic UCS mode, to have AutoCAD automatically and temporarily align the user coordinate system with the surface of whichever object you move the cursor over.
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