[SOLVED] Need help with ObjectGrass

[smirnov.oleg]

Hi.

So I'm trying to make a simple grass painting tool, using Image mask with ObjectGrass parented to global terrain object.

First of all I load mask image using img->load("path") function, then in update() use img->set2D function of Image class to change the mask.

And after that do: grass->setMaskImage(img, 0); grass->invalidate(); to regenerate or "update" grass.

It works just as i expected, but sometimes it crashes at setMaskImage() or invalidate(). What am i doing wrong here?

Code is attached ObjectGrass.zip

[smirnov.oleg]

In addition I tried ObjectMeshClutter. The same error "0xC0000005: Access violation reading location" is happening after of few minutes of 'painting'.

[andrey-kozlov]

Hello Oleg,

ObjectGrass uses the mask in a separate thread when AppWorldLogic modifying it in the main thread that leads to a race condition. Consider a ping-pong scheme for a mask modification: one mask is set to ObjectGrass and the other one is in modification and the modification is applied by swapping.

[smirnov.oleg]

Thanks Andrey. Swapping helped.