Question on Vector Mask Functionality

Question

Hello everyone, I'm fairly new to Photoshop CS 5 so I apologize if I am asking the wrong type of questions, here goes:
When working with Vector Masks can you:
1) "Link" or "share" one image's vector mask with other images? (ex. If I made "Building A" then duplicated it, but then wanted to change what Building A looked like, I would only have to change the source mask and the copies would be updated.
2) Move the image independent of the vector mask (it seems like I can only move the vector mask, not the image itself). Or in other words: can I move the image and have the mask follow it, instead of only being able to move the vector mask inside of the image boundaries?
My application of the question:
I'm making a 2D top down layout of a "city block" type area. To fill in the buildings, I've made Building A,B,C etc, and use multiple copies of each building. Ideally, I would like to be able to "link" or share say Building A's vector mask with all the other instances of Building A (so that when I change the master, they all change to the new mask shape). The second behavior I'm trying to find is the ability to move the layer without moving where the Vector Mask is on that layer (since it seems that you can only move where the mask is, meaning that even if I could share masks, they would all end up in the same place meaning I would have to re-position each one by hand again.
Any ideas are appreciated, thank you for reading.

Answer 1

When working with Vector Masks can you:
1) "Link" or "share" one image's vector mask with other images? (ex. If I made "Building A" then duplicated it, but then wanted to change what Building A looked like, I would only have to change the source mask and the copies would be updated.
Yes, this is possible, but not with the classic layer vector mask system in Photoshop. Layer masks are part of a layer, and not individual layers themselves, so they cannot be converted into a reusable object.
The solution is to avoid vector layer masks, and use a clipping mask/layer instead. A clipping mask/layer CAN be converted to a reusable smart object, and when you change one, all the other instances change as well.
The second part of the solution is to convert both the content layer(s) and the clipping mask/layer to a smart object. Then group the lot. Incidentally, if your buildings are made up of several elements you merely have to include those additional elements in the clipping group. Another advantage is that each elements can still have its own regular layer mask. Win win situation. And layer effects can be applied to clipping layers/masks, which is again impossible for layer masks. It also opens up the gates to a far less destructive workflow.
2) Move the image independent of the vector mask (it seems like I can only move the vector mask, not the image itself). Or in other words: can I move the image and have the mask follow it, instead of only being able to move the vector mask inside of the image boundaries?
This is also solved when using clipping masks/layers - both the content and the mask can be moved independently as regular layers. Another advantage is that both can also be transformed individually.
My application of the question:
I'm making a 2D top down layout of a "city block" type area. To fill in the buildings, I've made Building A,B,C etc, and use multiple copies of each building. Ideally, I would like to be able to "link" or share say Building A's vector mask with all the other instances of Building A (so that when I change the master, they all change to the new mask shape). The second behavior I'm trying to find is the ability to move the layer without moving where the Vector Mask is on that layer (since it seems that you can only move where the mask is, meaning that even if I could share masks, they would all end up in the same place meaning I would have to re-position each one by hand again.
Any ideas are appreciated, thank you for reading.
So here is my solution. I made a sample with two top view buildings that should be reused the way you want:
1) FIrst create groups for each building, and put the content in those. Then trace vector layer shapes over the content. Set the transparency for the mask layers to a sensible opacity setting for easier masking.
2) Put the vector shape below the content layer for each building. Then for (1) and (2), <ALT> click on the border between the content and the shape layer. (<OPTION> for Mac) This will mask the building content. (3) Do not forget to reset the layer opacity for the shape layers back to 100%!
3) Next, let's convert these building into recyclable objects. Convert each content and clipping mask layer to a smart object. Then rename those smart object layers to something sensible (honestly, I forgot to label the layers properly earlier, but you catch my meaning here ;-)
Done! To clone each building, duplicate the layer groups. For each instance you can move the content (handy if you are sharing multiple building graphics in the same bitmap or illustrator file), or you can decide to move the mask instead. Or both. Same holds true for transforming. Your choice. To move or transform a building, select the layer group.
To change or amend the masks or content, double-click on the smart object of your choice, and make some changes.
Also, don't forget that you can insert additional elements in a clipping group by placing it above the first clipped layer, and then <ALT> clicking again on the border between them. So in theory you could start constructing different looking buildings by adding in other smart objects in the clipping groups. The sky is the limit! This way you can create several building blocks to construct various buildings with different looks. And still limit the number of blocks - and all update-able.
Unfortunately, this is where the workflow breaks down a tad: due to the smart object's implementation in Photoshop you CANNOT edit the mask or building's content in context - instead it opens up in its own file window. This can be somewhat mitigated by placing both windows side by side (window->Arrange-->Two-up Vertical).
This brings us to the second caveat: when you do make a change, the edits are not updated in realtime in the master document. You must first save. Again a bit of a workflow breaker, but still... At least you now have a non-destructive instanced workflow.
The smart object content can be replaced easily with a right-mouse click on the smart object layer itself. Or use a externally referenced smart object instead if you prefer to generate your buildings in an external application.
Btw, Photoline's layer system is far more logical and easier to use for this type of work. Layer masks behave like regular layers. Layers, groups, masks, external file layers, and so on can be virtually cloned and instanced like smart objects, but the master object is editable in context, and all the other instances update in realtime. So it is more convenient. At least, that is my experience.
Hope this was helpful! Now go build your cities. :-)
PS: I was thinking: isn't Illustrator or InDesign is far more logical choice for this type of work where you need access to reusable blocks of content? It would also be a more efficient and speedier workflow - Photoshop isn't really meant for this type of work. And Illustrator and InDesign potentially provide better output quality. You can also divide your work in pages, and so on. Then again, you would probably lose the flexibility of smart objects.