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Polygon reduction tutorial with Action3D Reducer
Download a demo version of Action3D Reducer

"Our demo is identical to the complete version, except that it is saved-disabled. Download the demo version and see by yourself how easy it is to reduce your 3D creations."

Research Director

"There are 4 easy steps in Action3D Reducer to remove excess vertices & triangle faces in your 3D creation"


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Get ready to decimate huge 3D objects

"If you are creating huge 3D objects, this is the right version for you."

Game designer

This is a short tutorial on how to reduce a 3d object using Action3D Reducer.  Action3D Reducer is pretty straightforward to use, but there are some powerful features explained in this tutorial you should be aware of.

Most of the tools you need to reduce a 3d object are found in the progressive  mesh reduction toolbar.

Progressive mesh reduction toolbar

Progressive mesh reduction toolbar

Here is what you must do to reduce a 3d object. First import a 3d object.  Convert this 3d object into a progressive  mesh, and use the slider control to display the desired  level of detail  in the progressive mesh.    Create a snapshot of the progressive mesh at the selected level of details.  Finally,  export the reduced 3d object.

Import button Importing a 3D object

Just click on the import button to display the Import 3d objects dialog and select the file Bugman_original.3ds from the  Action3D Reducer sample folder (usually  \Program Files\Action3D Reducer  Demo\samples or \Program Files\Action3D Reducer\samples).

Import dialog

Import dialog

  PMesh buttonCreate a progressive mesh

To create a progressive mesh as a clone of the selected 3d object click on the PMesh button.  Once the progressive mesh is created, click on this button Display reduction options to display the progressive mesh display options.  You can reduce and increase the  level of detail of the progressive mesh in real-time using the slider control.  Select a desired % of triangles/vertices displayed of 13%.

Now make sure the quality constraints  are checked (max delta bounding box % and max delta surface area %),  and then click on the Apply button to display a progressive mesh which meet the  quality constraints at the specified level of detail.  The bugman should display 3430 triangles about 13.7% of the original.

Progressive mesh display options
Slider control and quality constraints

To display the geometry of the bugman, activate the option  Show active edges.  Now you can better see how the geometry changes  when you use the slider control.

All objects display options
Show active edges option

Desired LOD of 13% with quality constraints
13% with quality constraints

Desired LOD of 13% without quality constraint
13% no quality constraint


To inspect the bugman, use the arrow keys to move in the 3d world like in a first person shooter game.   Use the up, down, left, and right arrows to move forward,  backward, rotate left, and rotate right in the 3d world displayed in the active  3D view.   To make a 3d view active, click anywhere inside of it. If you  want to move up and down, just click on the up/down camera mode button .  To be able to move again forward and backward with the up and down arrow keys, just click on the Forward/Backward camera mode button.

To pick the bugman just click on it using your mouse. When the bugman is selected, a bounding box enclosing it is displayed, and you can use your mouse to rotate the box.

RM Mesh button Create a retained mode mesh

To create a retained mode mesh as a clone of the selected progressive mesh object click on the RM Mesh button.  The created clone is a snapshot of the progressive mesh at the displayed  level of detail.

Export button Export a retained mode mesh

To export the selected retained mode object click on the Export button. The retained mode mesh can be saved in a .x or a .3ds file.  This functionality is disabled in the demo version.

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