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Cactus spikes secret?


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I'm really stuck. Doing a cactus here. I thought it is a simple model but the devil is in between the detail.


I studied the sample cactus from planz library but still have problems with the spikes to match teh cactus shape.

FIrst of all the spikes are not following 100% the shape of my cactus. Second the spike plane (I use a texture for the spikes, with instanced geometry plane) is not on top if the ripples but always in the "valley" of the ripple.


I messed around for three or fours hours now with this stupid cactus and think I miss something fundamental.


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