VFX artists can specialize in different aspects of the production pipeline, depending on their interests, talents, and experience. For instance, concept artists create sketches, paintings, and illustrations to visualize the style, mood, and design of the VFX elements, requiring strong artistic skills, imagination, and knowledge of composition, color, lighting, and perspective. Modelers build 3D models of the VFX elements using software such as Maya, ZBrush, or Blender and need to have a good eye for detail, anatomy, and proportions as well as technical skills in sculpting, texturing, and UV mapping. Animators bring the 3D models to life by creating movements, expressions, and actions using software such as Maya, Houdini or MotionBuilder. They require a good sense of timing, rhythm and physics as well as artistic skills in acting, posing and storytelling. Riggers create the skeletal and muscular systems that allow the 3D models to be animated with software such as Maya Houdini or 3ds Max. They need technical skills in scripting programming and mathematics as well as artistic skills in anatomy and biomechanics. Simulators create realistic or stylized effects such as fire smoke water cloth hair and particles with software such as Houdini Maya or Nuke. They need technical skills in simulation dynamics and rendering as well as artistic skills in lighting shading and compositing. Finally compositors combine the VFX elements with the live-action footage or computer-generated backgrounds using software such as Nuke After Effects or Fusion. They require technical skills in tracking masking keying and color correction plus artistic skills in lighting shading and compositing.