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title: "Bindings Tab"
canonical: "https://documentation.chaos.com/space/VRAYHOUDINI/113279700/Bindings%20Tab"
format: markdown
---
This page provides information on the Bindings tab parameters of the V-Ray PhxShaderSim node. Overview This tab controls the channel mapping for the Fire, Smoke Color and Smoke Opacity of the Volumetric Shader. The string parameters specify the source channel that will be used to determine the respective component of the shader. The source field used for motion blur is also specified here. Parameters Fire Enable Fire  – Enables the emission component of the volumetric shader. Color/Intensity Field  – Specifies the float field used for rendering fire. The range of the specified field is displayed in the  Fire  tab → Intensity & Color. Modulate By Input Texture  – Multiplies the Color/Intensity field by a texture map connected to the  etex  input of the Volume Grid Shader. Smoke Enable Smoke  – Enables the diffuse component of the volumetric shader. Opacity Field  – Specifies the float field used for computing the smoke opacity. The range of the specified field is displayed as a blue-green overlay in the Smoke tab → Opacity Ramp. Modulate by Input Texture  – Multiplies the Smoke Color field by a texture map connected to the  dtex  input of the Volume Grid Shader. Color Field  – Specifies the source field used to determine the smoke color. This could either be a float or a 3-float vector field (e.g. "Cd.*"). When a single float field is specified, the  Smoke  tab → Color Ramp is used for remapping the color as a function of the selected field. When a 3-float vector field is specified, the  Smoke  tab → Color Ramp is disabled. Color Field as a Vector  – Enables parsing of color field as vector. Modulate by Input Texture  – Multiplies the Smoke Opacity field by a texture map connected to the  ttex  input of the Volume Grid Shader. V-Ray support both 3-float and vector velocity fields for motion blur. When using a 3-float field (default), the notation follows the name(.)wildcard standard. For vector fields you only need to provide the field’s name. Velocity Velocity  – Specifies the source field used for motion blur. The  Rendering  tab → Motion Blur Multiplier may be adjusted if the motion blur effect produces undesirable results. V-Ray does not support undersampled velocity fields for motion blur. Please ensure all fields used during rendering are of the same voxel size.