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I need a 3D animation software that fits these criteria: - able to download 3d models (that I have made in other programs) - able to take a list of coordinates and move from one to another (keyframe)

I will be given a long list of coordinates an will need to animate a robot (which I have already modeled) to follow these coordinates. I don't know if a program like this exists, but please let me know if you know something that might help.

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Seeing your question caused "Blender" to pop into my alleged mind. A quick search for "Blender animation with parameters" resulted in the top return being a StackExchange answer from the Blender group.

I've played a bit with Blender and recognize its power, but also its complexity. This particular link suggests that the files can be read into Blender using an animation nodes add-in, at which point it's well beyond my capability to understand.

I suspect that this will do as you require, however, but suggest that the learning curve will be steep. Perhaps not, for some folks with more active brain cells than I.

bouncy balls

This image is direct from the above noted link and represents a file of parameters applied to the models.

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    My first though too. Never got into Animation Nodes myself but I'm an avid Blender user daily and this would be my response as well – Duarte Farrajota Ramos Jul 10 '18 at 0:51
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Most 3D DCC (Digital Content Creation) programs will do this in one way or another - Blender surely will, as would Modo, Maya, 3DS, or C4D - it's down to familiarity and ease of setup for the coordinate import read node.

Blender is open-source and freeware, and though the Blender UI & learning curve have been notorious for opacity in the past, the recent V2.8 update is supposed to be a tectonic shift in Blender UI towards ease-of-use and comfortable onboarding. I also recently found the BforArtists fork, which is a fork of the main Blender development which has been repackaged to have a more artist-friendly, intuitive UI, whilst retaining all main fork Blender tools and systems.

Though I started many years ago with form•Z and Maya, my own preference is for Modo (having been an avid Modo user now since version 401); powerful but with a manageable initial learning curve, both direct modeling and procedural / parametric modeling tools, excellent animation and dynamics tools, and all that jazz - it is, however, very much full-cost professional software; the decision matrix revolves around your comfort in learning something like Blender, which is powerful, extensible and free, but has a unique and challenging interface, versus something like Modo, which is powerful, extensible, and far more artist friendly and learning friendly, but full cost.

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