How it Works - Internet Model Optimizer - Web 3D Products


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How it Works

Initial model

Scene size: 2.65 MB (uncompressed)
0.65 MB (compressed)
Number of triangles: 74522
Number of shapes: 33

Note: a VRML model is available in the Examples section.

Preprocessing

Perform preprocessing by choosing Preprocess Model from the Action menu. During preprocessing, abutted shapes with the same material are joined to the single shape and closely spaced vertices are combined.

Note: It is strongly recommended to preprocess the model before optimization.

Number of shapes:
Before preprocessing: 33
After preprocessing: 27

Number of vertices:
Before preprocessing: 40244
After preprocessing: 39859

Optimization

Select the shapes to be optimized and start the optimization process.

Set the maximal reasonable Optimization ratio.

Optimization in progress

In accordance with chosen settings, IMO generates an optimization database of polygons to be removed.

Tune Optimization Ratio

Now you can choose the desired polygon count by dragging the slider. All changes are immediately displayed in the 3D window.

Moreover, you can:

navigate in the 3D window

test the simplified shapes in various viewing modes - Solid, Wireframe, or Vertices

use the Highlight Selection and Show Only Selection options.

Excluding shapes from optimization process

As the destination optimization ratio for various shapes can be different, you can gradually exclude shapes from the optimization process. Drag the slider in the Choose Optimization Ratio dialog to the right until all the selected shapes look correct in the 3D window, then deselect the shapes you do not want for further optimization, and so on.

Close the Choose Optimization Ratio dialog to complete optimization.

Converting to splines

You can convert a polygonal model to its spline representation in order to improve the surface quality.

Note: Spline representation is only supported by ParallelGraphics' Cortona VRML client, other VRML browsers will show it as a polygonal model.

Crease Angle Tuning

Tune the crease angle for selected shapes to achieve a smooth look.

Drag the slider, or enter the crease angle value in degrees, then click Apply to preview the result in the 3D View window.

Editing

Finally, you can clean up the optimized model by manual editing. IMO supports three editing modes: shapes, edges, and vertices editing.

Edit Vertices

The Edit Vertices mode allows you to add, delete and move the vertices.

Publish a model

Publish the finished model. IMO creates a new folder in which all data describing the model is placed. This sub-folder will contain the model's .wrl file and the other resource files - textures. After the folder is created you may upload the model to your Web site.

Scene size: 63 KB
Number of triangles: 7862

Note: a VRML model is available in the Examples section.