Title: DeltaDE and DE Post by: mrrgu on January 15, 2010, 09:19:05 PM Hello Ok, I am not rendering any more mandelbulbs cause one of them freaked me out. However the last thing I came up with is that if you add a scalar product to the analytical DE method it becomes directional as the Delta DE, and I wanted to share this. This is very preliminary.. I will not test anymore though.. So the Idea is just to change the derivative in the DE method to a directional one..you can do this simply by taking the scalar product with the direction of the current ray. Then it should be almost the same as Bhuddis delta DE , but with the recursive derivative. dist = 0.5*|Zn|*log|Zn|/abs(dot(Zn',direction)) Direction is normalized ray direction.. For me it only worked if I first ran the ordinary omni directional DE method until I was close..then I changed to the directional one. Rays that never intersect can give infinite distance. With recursive derivative I mean the usual one.. Zn'+1 = P*Zn^(P-1)*Zn' + 1 Hope someone can explore this further.. |