Click in the Surface tab in the Ribbon, and then in Planar. If it not, click in the Workspace Switching button at the lower-right corner of the screen and change it. If you have not these things right now, don’t worry, at the end of this post you will find the Resources section in there, you will find a tutorial on how to create the opacity map of an image, step by step. To follow this tutorial correctly, you need to have at hand the image’s normal and opacity map, as you can see at the image below: So, if you want real tree shadows in the render, you need to tell AutoCAD how the shape of the tree is built, and here is where the opacity map comes into scene. And that’s not a good thing for your portfolio, right? While AutoCAD can display transparent images easily, the method of simply inserting the image in the drawing is not recommended if you are working in 3D, because you will notice a bad square shadow in the tree, in the rendered image. If you are looking for a way on how to insert trees in AutoCAD, let me tell you that the best way I know to make this is by creating a new material that uses a normal image and its respective opacity map, also known as alpha channel in the 3D World.
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