Image source: Marching cubes: A high resolution 3D surface construction algorithm, p. 165.
Image source: 3D Object Morphing with Metaballs, page 5.
Kommareddy, S., Siripun, J., & Sum, J. (n.d.). 3D Object Morphing with Metaballs. Retrieved from https://www.evl.uic.edu/creativecoding/cs488/finalprojects/metaball/metaball.pdf
Wyvill, G., McPheeters, C., & Wyvill, B. (1986). Data structure for soft objects. Visual Computer 2(4), 227-234.
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