ring

hi every one
i want to now how can model curve shape in top of the ring
i want to create quad model
boolean can not create quad model


make a basic ring shape, use booleans to carve it out if you want, then use the retopo tools to contruct the final mesh on the surface of the base mesh:
start by adding a plane, then deleting some of it’s vertexes…
place your vertex, or vertexes in front of your model, then press the button on the main header that looks like a magnet.
In the options to the immediate right of that button, set it to ‘face’.
more buttons will now appear just to the right. press the one that looks like a square in front of a circle.
you can retopo at this point. if you move the vertexes, they will snap to the model surface underneath.
but in order to see things better, you should go into object buttons >> display settings >> x-ray
then, in your 3D window, while in edit mode, press N for a whole new set of buttons, and find the one that says ‘hidden wire’ in the shading panel.