To understand the effects of sand for the Sandman, experiments were done with twelve types of sand, such as splashing, launching it at stuntmen, and pouring it over ledges. The results were mimicked on the computer to create the visual effects for Sandman. For scenes involving visual effects, Thomas Haden Church was super-imposed onto the screen, where computer-generated imagery was then applied. With sand as a possible hazard in scenes that buried actors, ground-up corncobs were used as a substitute instead. Because of its resemblance to the substance, sand from Arizona was used as the model for the CG sand. In a fight where Spider-Man punches through Sandman's chest, amputee martial arts expert Baxter Humby took Tobey Maguire's place in filming the scene. Humby, whose right hand was amputated at birth, helped deliver the intended effect of punching through Sandman's chest. Producer Laura Ziskin said the visual effects budget alone was approximately 30% more than the previous film.