AVS/Express Flag simulation from the XP_DEMO suite, in 3D Wind Field, with Analysis or Textures applied.
| Name | Type | Description | |
| texture | Image | optional texture for flag | |
The following lists all of the parameters found in the parameter blocks FlagParams and FlagLoopParams, which are accessed by the module FlagRaw and the UI Macro FlagUI.
| Name | Type | Description | UI Control |
| run | boolean | Toggle simulation on/off/ | Run/Pause |
| step | boolean | Oneshot to trigger next simulation frame. | Step |
| flag_wind_1 | float | First part of wind vector. | Wind Vector 1 |
| flag_wind_2 | float | Second part of wind vector. | Wind Vector 2 |
| flag_strength | float | Flag material strength. | Material Strength |
| reset | boolean | Toggle the simulation reset. | Flag Reset |
| release_top | boolean | Trigger release of top-left of flag. | Release Top |
| release_bottom | boolean | Trigger release of bottom-left of flag. | Release Bottom |
| flag_color | integer | Flag colouring mode choice: | Solid Colour Velocity Tricolor Force Tricolor Force Magnitude Texture Map |
| Name | Type | Description | |
| field | Mesh_Struct+ Dim2+ Space3+ Node_Data | output field of flag | |
| obj | DataObject | output object of flag | |
The Flag demo application is a running physical simulation. Over the 2D mesh of the flag, gravity, friction, wind force, and elasticity constraints are simulated. Optional controls allow two corner points to be constrained (tied) to a flag pole. Using the File-Open, you can select alternate flag images to use to color the flag. To view simulation parameters, Velocity Tricolor, Force Tricolor, and Force Magnitude modes can be selected. The raw mesh field data is available in the network, such that other visualization tools could be added, such as force magnitude contours, normal vector glyphs, etc. The simulation will run forever, and can be started using the Run/Pause control button. The flag strength control controls material strength parameter during the simulation.
texture
Optional input image to be used as texture map for the flag.
run
Toggle execution of the flag simulation.
step
Single step through the simulation.
flag_wind_1
First part of wind velocity vector.
flag_wind_2
Second part of wind velocity vector.
flag_strength
Flag material strength.
reset
Reset the flag to it's original starting place.
release_top
Trigger to allow top-left corner to be released from its tie.
release_bottom
Trigger to allow bottom-left corner to be released from its tie.
flag_color
Select the colour mode for flag.
field
Output mesh and node data of the flag.
obj
Renderable object of the output mesh and node data of the flag.
The low-level FlagRaw module and the modified FlagLoop module are used in this User Macro flag.
An example application FlagEg is provided, which demonstrates the flag simulation with two image textures available.
iac_proj/flag/flagmacs.v contains the flag User Macro, the Flag Functional Macro, the FlagUI UI Macro, and the example application FlagEg V definitions.
The FlagMacs library inherits its process. As this library contains no procedural code, the process is not important. The low-level FlagRaw module, executes under the process specified in its library, not the process defined in the high-level library.
The simulation will sometimes pause - pressing reset will restart the simulation successfully.
Ian Curington - AVS
Paul G. Lever Andrew Dodd
International AVS Centre Manchester Visualization Centre Manchester Computing University of Manchester Oxford Road Manchester United Kingdom M13 9PL
FlagParams, FlagUI, Flag and FlagRaw.