deform terrain example - is this useful ?

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I guess my next test will be to create a tilemap larger than the screen and allow scrolling as well.
Im afriad I dont quite understand how I can decide how many images I will store in Video Ram.
Could someone point me to a 'simple to understand' example of doing this ?
I assumed when you create a TImage it automatically gets sent to video ram and the video card determines which old / unused images it will discard internally if it runs low on space. I didnt know there was a way to force images to be held in the video ram.

The compile error is a mystery to me. The code is not doing anything fancy.. in fact I always try to make a point of only ever using the built in functions. As suggested it may be you are not using the latest modules.