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ArmorPaint is a stand-alone tool fully specialized in physically based texture painting of 3D models. Import desired geometry and start painting right away. A modern viewport provides instant visual feedback as you paint.
Only the absolute basics are working. There is no undo, masking or layers yet. As the time goes, these issues will get resolved.
Drag and drop unwrapped .obj, .fbx or .gltf file into the viewport. This will replace the currently painted mesh. Importing .blend format is in progress but not yet supported. Use Blender to do the conversion in the meantime.
As of now ArmorPaint is known to work on Intel HD5100 graphics card. For 8K/16K texture painting, GTX 1060/6GB or better is recommended.