#declare look_at_z = (Max.z - Min.z) / 2 #declare look_angle = degrees(tanh((Max.z - Min.z) / (bottom_diag / 2))) #debug concat("box_diag:", str(box_diag, 5, 0)) #declare box_diag = sqrt(pow(bottom_diag, 2) + pow(Max.z - Min.z, 2)) #debug concat("bottom_diag:", str(bottom_diag, 5, 0)) ![]() #declare bottom_diag = sqrt(pow(Max.y - Min.y, 2) + pow(Max.x - Min.x, 2)) #declare Max = max_extent(m_OpenSCAD_Model) #declare Min = min_extent(m_OpenSCAD_Model) You’ll need to replace ‘m_OpenSCAD_Model’ with the name of your own model in the ‘my_model.pov’ below. Open up ‘my_model.inc’ with a text editor, and note what name it declares the model. Next, we declare the rendering instructions for the POV file, called ‘my_model.pov’. Then use the compiled executable stl2pov to convert your STL to a POV include file with: Download the project and compile using ‘make’. We can data dump the STL file into my_model.inc by using an old C program called stl2pov. We’ll put the data in a file called ‘my_model.inc’, and then include it in ‘my_model.pov’, which contains the rendering instructions of the POV file. First, we’re going to put the data and the rendering instructions different files for clarity. ![]() POV files can contain both the data of the model, and the instructions of how to render the scene, such as how much lightning, and what position and angle to put the camera.Ī tutorial on the ins and outs of a POV file would be beyond the scope of this post, but we can start with a simple one. We’ll need to convert them into a format they can read, which are POV files. However, povray doesn’t directly read STL files. If you’re using ubuntu, you can install it using aptitude If you’re on a mac, you can install it using homebrew. ![]() We’ll be using a raytracer called Pov-ray. There are different ways to do this, but here I’ll detail the manual way to render images from STL files. Raytracers are pretty sophisticated programs that can generate very realistic scenes, but for us, our models and scenes are relatively simple, so they don’t take very long. They do this by modeling how light bounces travels from a light source, bounces off an object, and gets captured by the camera. To convert STL files to images, you use programs called raytracers, which take a 3D model or scene, and render it as a picture. Soon, we’ll release a library that does this for you. So how do you render or convert STL files to images? Here, we’ll detail a manual way to do it. We can render a model to provide image previews
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