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If you need your particles or points to be rendered with constant size according to your camera, in Houdini, this is what you could do. Add a UV Texture SOP. Change texture type to Perspective from Camera. Insert your Camera path. Change attribute class to Point. Add a Point Wrangle SOP. We want the scale…

Starting from the basics: SOP: surface operator, geometry network DOP: dynamic operator, dynamic network VOP: vex operator, vex builder network SHOP: shader operator, shader network CHOP: channel operator, motion/audio network COP: compositing operator, img network ROP: render operator, out network POP: particle operator, particle network Points, vertexex, primitives. Vertexes are part of a primitive. Points are the…