Painting with a Texture Map
From ZBrush Info
To PolyPaint with a texture map you must delete your UVs by pressing Tool: Texture: Disable UVs. If you have UVs ZBrush will display the texture map on your model instead of letting you use it to PolyPaint with.
You can create new uvs when you are done PolyPainting by pressing Tool: Texture: Auv. Make sure you are at the lowest subdivision level when you do this.
You can import your UVs again after you have finished painting by following these simple steps:
- Press Tool: Morph Target: Store MT to store a Morph Target
- Press Tool: Import to Import your OBJ with your Uvs made from outside of ZBrush
- Press Tool: Morph Target: Switch to switch back to the previous geometry state. ZBrush will keep the changes you made to the UV but reverse any change the imported OBJ made to you model's geometry.
To enable PolyPainting with a texture map simply delete your UVs. To avoid sculpting as you paint, make sure Zadd and Zsub in the Draw palette are off, but Z Intensity should be left at greater than 0 or the texture (or alpha) will not be applied.
To Learn how to Convert a Texture into PolyPainting Click Here.
To Learn About Baking PolyPainting into a Texture Map Click Here.
