How should I do if I want to texture a sphere (for example ) with this alpha :
try and use the projection master
If your alpha tiles seamlessly, you can use the Deco brush with the Tile Texture option turned on. Convert your alpha to a texture and then use Projection Master to paint.
Even if it’s not seamless, you can also use the techniques that I teach in this thread. Or you can convert the alpha to a texture and use it with the Directional Brush. In this case, use an alpha like Brush 01 and use the DragRectangle stroke type. That way, you can rotate the texture as you draw it. For both of these options you’ll use Projection Master, and you will be surprised by how fast you can create a great-looking texture.