If I am understanding your first question correctly you are trying to render an object with no (or rather transparent) background? If so this is only sort of possible as far as I know:
- Look in the Render Menu.
- You will find a sub pallet called BPR Render Passes, open that.
- After you do a BPR render on your object you will see that this pallet fills with little icons.
- Export your BPR render.
- The one you now want is called Mask, click on that to export it.
- In Photoshop (or what ever image editor you like) open both files and use the one called Mask to make a selection around your object in the BPR render.
- Now you can copy your BPR object and paste it into a new transparent document.
- You may or may not want to use anti-aliasing on your selection depending on what you want to do with it.
- Save using what ever format you like that supports transparency: .PNG, .TGA etc…
For your second question there are two ways I know of, one is very fun and the other is tedious (but possibly more precise)
The fun way is easy to describe and I will be less specific in my description:
- Make a ZSphere. (hold down SHIFT so it will orient it self so its dividing line is horizontal)
- Turn Edit Mode ON.
- In the Transform Menu turn on Activate Symmetry.
- Turn off X.
- Turn on Y.
- Turn on R (radial).
- Set Radial Count to 6.
- Hold down Shift and hit the letter A (Your Zsphere should turn one color, its now in sketch mode).
- make your brush size fairly small, somewhere between 8-15 maybe.
- Draw on your ZSphere.
- Experiment and have fun!!!
The Tedious way is harder to describe and requires you to learn a few things possibly but I will try to steer you in the right direction and hope someone else can be more useful:
What you need to know how to do is move and rotate your “arm” in the Deformation Pallet.
You also need to learn to Duplicate your arm in the SubTool Pallet.
From there you would do something like this:
Duplicate the arm in the subtool menu.
Select the new tool (your new “arm”) in the subtool Pallet.
Rotate it using Rotate in the Deformation Pallet. (For a 6 armed thing I have no idea what angle, but thats your problem! GRIN!)
You may need to try this a few times using Offset on your first arm to get it positioned correctly.
One thing that is VERY helpful while moving things with the deformation pallet is turning on Floor, it will show you the basic center of the world and give you X, Y, and Z lines in color on a grid so you can see what is going on. (this is a VERY cool thing in Zbrush and more so than in other programs as I have found out)
Do experiment with Offset, Rotate and Size.
One other thing to learn (and this would have made an eight arm one trivial) is how to use Mirror and Weld in the Geometry Pallet.
I know this last bit is rather vague and I’m sorry, I dont know how to describe it better with out taking many pages. However as you learn this stuff you will get the idea quickly I think.
I hope this is helpful.
Cheers and good luck!
Mealea
. I forgot to ask how to make specific dimension for my sculpted work?? Let’s say, i already have my 6 arm chandelier, and i want it to be 27’’ diameter by 32’’ high, how to do that in zbrush? Thanks again.