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There are three other tabs that we need to check out, plus a quick look at this background feature here. I am going to go get a CheckerBoard and hook it up to the BG input. I don't need the CheckerBoard Property panel anymore. If you select on background, that means you're selecting this CheckerBoard input, but you don't see anything until you set the mix value, okay. So this pop-up allows you to choose black, the source image, the destination image or a background input, but you won't see anything unless you move the background mix slider.
I am going to set the output to Source in order to show you the Transform tab. Also, I'm going to have to have to turn the grids on. The Transform tab allows you to do a translate, rotate, and scale of both grids, either the source or destination. By default, they are locked together. so if you change one, it changes the other. I will put that back. But this button allows you to unlock the destination from the Source grids. So if I go back to my Grid tab, and I say I want the output to be the source warped, then on the Transform tab-- remember I have deconnected them right here-- I can now do a scale or rotate or any other thing I want to the grid.
Remember, this is going to be applied to the grid. Back to the GridWarp tab. The Render tab has just one or two little options. The Submesh Resolution is how much it subdivides the grid to do the warp. The larger the number the more fine detail you will get; the lower the number the faster it will render. And the filter of course you get to choose which kind of filter you would like to use. The Options tab just allows you to change the color of your grids. In case you are working with blue and red images, you might not want to have the grids colored blue and red.
So there you have it. The new GridWarp node is a huge improvement over the old one, in both functionality and stability. But as you saw, it's only suitable for situations where you don't need a great deal of fine control. If you do need fine control, then you will want to use the SplineWarp node.
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