I found a way to make "hybrid" mandelbulbs combining two different powers.  It's
a simple adjustment with no practical impact on computational time.

newx = r^n1 * sin(theta*n1) * cos(phi*n2)
newy = r^n1 * sin(theta*n1) * sin(phi*n2)
newz = r^n1 * cos(theta*n1)

As a sample, I attached a test render of an 8,4-power mandelbulb.

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