Interpolation – Specifies how emission/scattering/absorption values are computed from the channel.
None – No interpolation, the fastest method, but also prone to artifacts. Linear – Linear interpolation, good quality, and reasonable speed. Quadratic – Quadratic interpolation, the best results but the lowest speed.
Step size – Determines ray marching step size. Increasing the value leads to faster rendering with more noise and possibly some artifacts, while lowering the value leads to less noise but slower render times.
Alpha mode – Specifies how the object is visible in the alpha channel. Available modes are:
Default – This is the default mode. In this mode, the object's alpha value is derived from the data in the OpenVDB file. Always black – In this mode, the object's alpha value is black (the object shows as transparent). Always white – In this mode, the object's alpha value is white (the object shows as opaque).
Flip frame – Flips frame of the OpenVDB channels (more specifically the Y and Z axes).
Motion Blur – Defines how motion blur and frame interpolation are computed.
Disabled – Both frame interpolation and motion blur are disabled (in both cases we only use the frame closest to the current time).
Simple – Simple linear interpolation between two OpenVDB frames, may lead to artifacts.
Velocity-based – Enables smooth interpolation/motion blur using velocities stored in the OpenVDB file. For this mode to work properly, you must select a velocity channel.
Multiplier – Specifies thestrength of the motion blur effect.
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Frame interpolation is necessary when OpenVDB sequence frames are offset by a non-integer number or have a non-integer speed multiplier.
Viewport display – Determines how the current OpenVDB fame is displayed in the viewport.
Wire box – Only bounding box of selected OpenVDB channels is displayed.
Point cloud – The volume is displayed as a point cloud; each point position is determined by the volume density and its color by channel mapping/tint settings (requires loading of channels - slow for huge files).
Quality – Determines a total number of points displayed for the point cloud preview mode.
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Example: Interpolation
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Interpolation set to none. Render time: 24s. The result is visibly pixelated
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Interpolation set to linear. Render time 24s (the same as when using no interpolation). The result appears much smoother and more natural
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Interpolation set to quadratic. Render time 31s. The result appears more natural, but the rendering is slower.
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Example: Step Size
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Step size 0,5cm. Render time 3min 46s. The smoke is thick, and details are preserved.
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Step size 5cm. Render time 48s. The smoke gets thinner, and there are less details visible.
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Step size 50cm. Render time 29s. The whole object becomes transparent and the details are lost.
