Aaron Wong asked 3 years ago
Hi,
I was wondering if it is possible to create a target image or texture while the experiment is running and have that displayed to the screen, rather than having to specify it in advance as a separate target? For example, if I wanted a target to have a certain percentage of (randomly selected) pixels that were a different color, could I generate that in the code somehow and have it be displayed? Alternatively, is there a way to choose a particular pre-generated image file in the code by modifying the VCODE directly rather than having to load all the images in as separate targets and switching between targets?
Thanks,
Aaron
Koloman Varady Staff answered 3 years ago
Hi Aaron,
Hmm, good question. You can change a VCODE to display a different image by overwriting its fill colour (VCODE(5)). How images work is if your fill colour is -1, then the image that’s displayed is the 1st (in alphabetical order) jpg/png/bmp that is in the folder. If it is -2, then it will be the 2nd jpg/png/bmp, -3 will be the 3rd, etc.
That can be an inconvenience if you have a lot of images in a folder (say 100+ images).. for example, I know of one task that uses about ~200 images and that takes maybe 2 minutes to load in Dexterit-E (which is a real bummer). For overwriting pixels.. best I can think of is using the repeat targets to write lots of small rectangles over the image. If they’re small enough (maybe like 1 or 2 mm in length), you could do over 500 squares without losing any frame rate. I don’t know if that’s good enough but I can’t think of much else.
Duncan is out today but he might have other ideas. I’ll check with him on Tuesday. Hope that helped even a little bit!
Cheers,
Koloman