There are many alternatives to Thea Render for Mac if you are looking for a replacement. The best Mac alternative is Adobe Dimension. It's not free, so if you're looking for a free alternative, you could try Cycles Renderer or LuxCoreRender. If that doesn't suit you, our users have ranked more than 25 alternatives to Thea Render and many of them are available for Mac so hopefully you can find a suitable replacement. Other interesting Mac alternatives to Thea Render are Keyshot (Paid), V-Ray (Paid), appleseed (Free, Open Source) and RenderMan (Free Personal).
Pixie is an open source RenderMan renderer for generating photorealistic images. You can compile Pixie on Windows (using Visual Studio 2005), Linux and on OSX (using XCode or unix style configure script).
YafaRay is a free open-source montecarlo raytracing engine released under the LGPL 2.1 license. Raytracing is a rendering technique for generating realistic images by tracing the path of light through a 3D scene.
Visual Designer is an advanced GPU & CPU photorealistic renderer with a unique set of features to handle all the aspects of your creation. It will save a significant amount of time and let you concentrate on refining your designs & arts aesthetics.