About Simplification | |||||
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Tessellation techniques are used to handle large sets of data and divide them into suitable product structures for analysis purposes. Prior to launching the preparation process, the data is already tessellated into triangles to generate exact geometry adjusting the 3D Accuracy value. Experience Models Preparation provides you with two different techniques to simplify further your models: the HSR (Hidden Surface Removal) and the Decimate options that reduce the number of existing triangles of a model's representation.
You can combine both techniques until you are satisfied with the resulting prepared model. You can access the HSR and Decimate commands in the Data Preparation action bar. For more information about the Experience Models Preparation, see Action Bar: Data Preparation Section.
Hidden Surface Removal (HSR) Method
The Hidden Surface Removal method consists in removing surfaces to split complex geometry into small and simple elements. The HSR method is based on two parameters including viewpoints and screen resolution.
HSR allows you to verify and determine which objects are to be displayed on screen.
An object must be represented by at least one pixel on the screen for the HSR to specify it as visible. Subsequently, the result of an HSR operation is greatly affected by the zoom level and to a lesser extent by the screen resolution.
Decimation Method
The decimation method consists in reducing the number of triangles of an existing model to decrease the size of the model. By default, Experience Models Preparation provides three levels of compression for the resulting models: weak, medium and strong.
The table below provides examples of a multi-result calculation for two different CAD models marked A and B:
| Number of Triangles for Model A | Number of Triangles for Model B | |
|---|---|---|
| Original model | 12412 | 86668 |
| Low compression level (weak decimation) | 8202 | 18703 |
| Medium compression level (medium decimation) | 3602 | 9605 |
| High compression level (strong decimation) | 2864 | 8453 |
You can also specify the compression level to apply for the calculation manually by clicking 
to expand the Advanced region and display the Fixed chordal deviation and Proportional chordal deviation options.
Understand Decimation Results
Decimation results are ordered in the multi-results view using bar chart icons that reflect the result quality level. The reference model appears in first position to the left followed by a maximum of four additional results.
Under each bar chart icon, both triangle number information and triangle reduction percentage compared to the original model appear.
You can display a detailed result as you hover over a specific icon, switch from one result to the other, and refine the decimation results, launching recursively the calculation from an existing result of your choice.
Consider the following example where:
- The original model contains 1000 triangles. See (1).
- You run a first decimation with the fixed chordal deviation option selected.
- You hover over the result icon (2): the detailed result information is available in the the tooltip (3).
- You select the result of the first decimation (2) and perform a second decimation (4).
- You hover over the result icon (4): the detailed result information is available in the the tooltip (5).
The following tables describe how to read the results under:
| Original model (1) | First Decimation Result (2) | Detailed Result Information (3) |
|---|---|---|
 |  | Mode: Fixed chordal deviation = 0.2 |
| 1000 triangles | 800 triangles | Original number of triangles: 1000 Result number of triangles: 800 |
| 100% | 80% | Reduction: 20% |
| Original model (1) | First Decimation Result (2) | Second Decimation Result (4) | Detailed Result Information (5) |
|---|---|---|---|
| |  | Mode: Fixed chordal deviation = 0.2 |
| 1000 triangles | 800 triangles | 400 triangles | Original number of triangles: 800 Result number of triangles: 400 |
| 100% | 80% | 40% | Reduction: 50% |