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How can I move a displacement?

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AJ RobinsonHow can I move a displacement?
by on Sep 7, 2012 at 2:22:24 am

Ok I need a little help here.

I make a two groups.
I apply bump map to the bottom group.
I add my displace footage to the top group.
I drag my top group into the bump map image well.


Now, I can't resize the displacement it or move it.

What do I need to do to be able to resize the displacement and move it?


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Simon UbsdellRe: How can I move a displacement?
by on Sep 13, 2012 at 10:40:24 am

Make sure the Bum Map Image Source is Group 1 (not the Corona Emitter and then apply your transform(s) to your Corona Emitter (not to Group 1) and it will work fine.

Simon Ubsdell
http://www.tokyo-uk.com


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AJ RobinsonRe: How can I move a displacement?
by on Sep 13, 2012 at 11:23:30 am

Thanks but I don't really understand what your trying to say. I am not making any changes to the Emitter at all. Would you please explain this step by step?

Thanks,

AJ


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Simon UbsdellRe: How can I move a displacement?
by on Sep 13, 2012 at 11:47:13 am

You asked : "What do I need to do to be able to resize the displacement and move it?"

I am assuming that you want to use the Corona Emitter as you displacement source and that's what you want to move around.

The project you have set up looks just fine, except that you need to use Group 1 as the source for the displacement - I imagine you are doing this but I can't see for sure. If not then drag Group 1 into the source well for the Bump Map.

Now when you go to the Properties for the Corona Emitter any changes you make to the position or scale will be affect the Bump displacement. Changing the Group 1 properties won't have this affect and the map won't move or scale at all, and that's probably what you are trying to do, if I'm guessing rightly.

Hope that makes more sense.

Correction; if you want to make changes to the scale of the source in this case you will need to use the scale controls (Radius and Scale) inside the Emitter itself. Changing the Emitter Properties for scale doesn't work quite the way you'd expect.

Simon Ubsdell
http://www.tokyo-uk.com


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Simon UbsdellRe: How can I move a displacement?
by on Sep 13, 2012 at 12:17:49 pm

Another hopefully useful note about using Bump Maps - the filter will stretch your source image to try and make it fit with the destination and this can lead to undesirable results if your source image is not the same size or aspect ratio as the destination.

In this case the simple answer is to "precompose" (to use an AE term) the source image over a background so that it the same size as the destination. You can do this by making a solid black generator or the right size and putting that into a group with your bump source image. Use the new group as the source for the Bump Map and it will behave a lot more predictably.

Simon Ubsdell
http://www.tokyo-uk.com


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AJ RobinsonRe: How can I move a displacement?
by on Sep 13, 2012 at 12:33:31 pm

OK I see! When you add the black solid it lets you move things around! Thanks!


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Simon UbsdellRe: How can I move a displacement?
by on Sep 13, 2012 at 1:04:38 pm

Sorry, I'm obviously not making myself clear at all. I only discussed the Corona Emitter because that's what you had in your example and I thought that's what you were having problems with.

Here's how I'd do it with fire as a source image.



Note that I've made a group consisting of my fire layer and a solid black color (which is the same size as my overall comp and hence the destination image). Importantly I've used this group as the source for the Bump Map as you can see. I don't want to use the Fire layer itself as this is where your problem lies in trying to scale or move your bump source.



Notice that I am now using the transforms in the Fire layer's properties in order to move and scale.

It's as simple as that.

Any clearer?

Simon Ubsdell
http://www.tokyo-uk.com


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AJ RobinsonRe: How can I move a displacement?
by on Sep 13, 2012 at 1:29:55 pm

Yes yes I'm very sorry for the misunderstanding!

Thank you very much!

AJ


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Simon UbsdellRe: How can I move a displacement?
by on Sep 13, 2012 at 1:30:43 pm

No problem :-)

Simon Ubsdell
http://www.tokyo-uk.com


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