EDIT: I got it somehow to work, although theres still the weird issue that preview is pink.
And worldbuilder goes black screen when i click shrubbery category then tells me impossible to add object. but then i can add them.
The tutorial would be very nice if you can do it! thanks
EDIT: all working fine now. pink texture and wb blackscreen was due to having a 2nd .psd texture in material editor. fixed all working good now
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