In visual effects land, volume relates to a simulation of nature such as clouds and smoke & fog amongst other gas-like things. Volumes are especially important in giving scenes a sense of realism because allow objects to have 3D shape that can interact with lighting and other environmental elements.
Types of Volumes in VFX
Smoke and Fire
Smoke and fire can interact properly with light sources and cast shadows to achieve a more realistic look.
Clouds and Fog
Volume based clouds and fog are necessary in VFX for environment settings, outdoor scenes (through fog, haze.)
Liquids and Gases
Volumetric simulations are also used to show liquids in a way which behaves like gas, for example mist of vapor.
Importance of Volume in VFX
Volumes have become a more flexible way to add realism and transport storytelling in the environments. They help filmmakers and 3D artists simulate natural phenomena that otherwise may be impossible to reproduce practically. These volumetric elements mix with light in VFX, leaving behind accurate shadows, depth and a feeling to really being part of the scene.
Software for Volume VFX Rendering
Houdini: Powerful VFX software that excels in volumetric simulations.
Blender: Blender uses the powerful Cycle render engine with its smoke, fire and fog modeling tools.
Maya with Arnold: Due to it being a full fledged feature film quality rendering, Maya can take advantage of advanced volume rendering options such as those available in the Arnold renderer used by top VFX studios.
Volume rendering can be a super powerful tool for VFX animators, getting them the most realistic look of their environments and at the same time keep pushing visual storytelling, both in film and in animations.
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