Use simple orbit trap

fractal {
	// Set region margins to left=-3.0, bottom=-1.5, right=0.0, top=1.5
	// Declare state vector as [x,n] where x and n are built-in variables
	orbit [<-3.0,-1.5>,<0.0,1.5>] [x,n] {
		// Declare rectangular orbit trap with center in (0,0) and name rectangle
		trap rectangle [<0,0>] {
			MOVETO(<0,0>);
			LINETO(<0,1>);
			LINETO(<1,1>);
			LINETO(<1,0>);
			LINETO(<0,0>);
		}
		// Iterate for n from 0 to 200 stopping when mod2(x) > 4 or x falls inside trap rectangle
		loop [0, 200] (mod2(x) > 4 | rectangle ? x) {
			// Declare orbit equation where x is a state variable and w is current point of region
			x = x * x + w;
		}
	}
	// Set background color to alpha=1, red=0, green=0, blue=0
	color [(1,0,0,0)] {
		// Create palette with 200 colors and name gradient
		palette gradient {
			[#FFFF0000 > #FFFFFFFF, 10];
			[#FFFFFFFF > #FFFF0000, 190];
		}
		// Apply rule when n > 0 and set opacity to 1.0
		rule (n > 0) [1] {
			// Set color to element n - 1 of gradient (gradient has 200 colors starting from index 0)
			gradient[n - 1]
		}
	}
}

Use a simple orbit trap


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