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changes.mady.by.user Kristin Ivanova

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changes.mady.by.user Svetlin Nikolov

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Based on | trSource – Allows you to select how the smoke opacity is computed. By default, this is set to the Simple Smoke option. It could also be based on a texture map, or read from the cache files - in that case, the corresponding grid channel must be enabled from the Output roll-out before the simulation is run.

  • Simple smokeSmoke – Use directly the Smoke channel as opacity, without remapping it through the Opacity Curve. The opacity is controlled only by the Simple Smoke Opacity. This mode is the same as setting Based on to Smoke and creating If you want to get similar results to Simple Smoke mode using the Opacity Curve in Smoke mode, create a straight line in the Opacity diagram Curve from coordinates [0; 0] to [1; Simple Smoke Opacity], and then bend the middle of the curve upwards. As Simple Smoke Opacity increases, the curve needs to be bent more strongly.
  • Temperature – Use the temperature channel and remap it through the Opacity Curve to get the rendered opacity. Can be used to produce smoke without needing the smoke channel in the simulation.
  • Smoke – Use the smoke channel and remap it through the Opacity Curve to get the rendered opacity.
  • Speed – Use the magnitude of the velocity channel and remap it through the Opacity Curve to get the rendered opacity.
  • Texture – Use a texture map plugged in the Texture slot as opacity, without remapping it through the Opacity Curve.
  • Fuel – Use the fuel channel and remap it through the Opacity Curve to get the rendered opacity.

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This option is ignored when rendering with V-Ray GPU.

Opacity diagram – Curve – When the Based on option is set to a grid channel, this curve remaps grid simulation data to smoke opacity. The sim data channel is laid out horizontally along the X axis in the opacity curve. The opacity is mapped vertically on the Y axis.

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You can use the following controls in the diagramOpacity Curve:

Double click – Creates a new point or changes an existing one.
Left button drag over a point – Moves the point. If several points were selected beforehand, they will move the same amount.
Left button drag over several points – Selects several points.
Middle button drag over the background – Drags the visible area. If the Shift key is pressed, scales the diagram curve in the corresponding direction.
Mouse wheel – Zooms in/out.
Mouse wheel near the borders of the control – Zooms in/out only along X or only along Y.
Right-click – Displays a drop-down menu where you can add a point, edit or delete a selected point, and fit the entire diagram curve into the view. If multiple points are selected, they can be edited simultaneously. Multiple selected points can also be scaled and flipped with the Scale Selection option as seen below.

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