Houdini 11 How to
  1. On the Create tab of the shelf, click the Grid tool.

  2. Rename the geometry node from grid_object1 to flag.

  3. At the geometry level, adjust the following parameters

    • Set the Orientation to XY plane.

    • Set the Size to 10 and 15.

    • Set the Rows and Columns to 20 x 20.

  4. At the object level, make sure the flag node is selected. On the Cloth tab of the shelf, click the Cloth Object button.

    This will turn your grid into a cloth object.

  5. In the AutoDopNetwork, select cloth object.

  6. On the Material tab, adjust the Stiffness parameter’s Stretch/Shear/Bend values to 10000/500/500.

    Note

    The stiffness value is very high because stretch is undesirable in this example.

  7. Adjust the Damping parameter’s Stretch/Shear/Bend values to 20/50/50.

    Tip

    Turn on the display of points by clicking the display points button on the display options toolbar.

  8. Pin a side of the flag by clicking the Cloth Pin Constraint tool on the Cloth tab of the shelf, selecting all the points along a side of the flag, and pressing Enter.

  9. Append a Wind force node to the pin constraint node using the tab menu.

  10. Modify the following parameters

    • On the Wind tab, set the X value of Velocity to 100.

    • On the Noise tab, set the Turbulence to 3.

    • The Y value of Frequency to 40.

    • The Y value of Amplitude to 5.

    • The Y value of Offset to $F.

  11. Turn on the display flag of the wind force node and press play button on the playbar.

The parameter values in this example are merely suggestions. Customizing the grid topology, divisions, wind force and noise, stiffness, and damping will result in different cloth reactions.