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VI Model Building with SceneVision-3D

You've aligned all your range files, aligned all your color, and the color range files are aligned as a result. You will only use

the color range files for this process. SceneVision is running and the scene is loaded on a fast PC with lots of memory.

Note: The computer (not you) will be busy and unavailable for 1 or more hours.

Note: This guide describes how to build high quality, 'simplified' models. Building quick models is described below.

Note: You can follow these same steps with the original range files to build grey scale models.

First, create simplified models of each individual scan.

1. In the scene tree, in the Range Data folder, select every color range file you might want to include in the model. Use Ctrl to make multiple

selections.

2. Select Create Simplified Model from the Edit menu. A window will appear.

3. Select a size. Small will produce files with the smallest number of triangles. In most cases these will be very satisfactory – and easier to work

with. Select Ok.

4. Next, name the output model file for each scan, one at a time. (Use the default in most cases, or choose another name.)

When you've named them all the processing will begin. Go home. Full scans can take 45 minutes each – or more.

When you return, your simplified, individual model files will be ready. You'll find them in the scene tree in the Model Data

folder – named, by default, filename_reduced.wrl, each in its own scan folder. Double-click on any of them to view them

individually.

Next, combine the simplified models.

5. To combine them into a single model, select each of these files (or just the ones you want to combine) in the scene tree, and select Create

Model from Selected Data in the Edit menu. You'll be asked to name the new model. This will produce a model combining all of the files

selected.

If you want to keep this 'merged' file you need to save it with Save File or Save File As in the File menu.

The resulting file will have a lot of overlapping areas. The quick guide on Model Editing discusses how to reduce the

overlap.

6. You can also build up a model one file at a time.

Select two models and then Create Model from Selected Data. Save the resulting model.

Select this resulting model and a third model. Select Add Selected Data to Model. You'll be asked to choose a 'base file to

merge other data into'. Choose the merged model. It will then add the third model to the merge. Save this. Add additional

models as needed.

Tactical Tips

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You can add selected regions from a range (rtpi) file to any model. (The addition will not be simplified.) Select a region in a range

file. Then, in the scene tree, select the range file and the model you want to add it to. Finally, select Add Selected Data to Model in

the Edit menu.

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Sometimes you know that you only want to include a part of a scan, instead of the whole scan, in a model. You can save time by

only coloring the part you want to use. In addition, you can reduce the model simplification time above by telling the program only

to simplify the part you want to use. To do this:

In step 1 above, open the file you only want part of. Use the Select Region button to select the part you want to include.

When you get to step 3 above, choose Selected Data Only and only the highlighted region will be included in the simplified

model.

•

You can build models quickly and easily by skipping the Create Simplified Model function. Use the two functions Create Model

from Selected Data and Add Selected Data to Model. Choose a range (rtpi) file – or select a region of a file – and create a model.

Then add range files or regions of range files to that model.

Each time you do this, the function uses the Preferences setting Target Number of Triangles per Model. It 'decimates' the

data uniformly (horizontally and vertically) to reduce the number of triangles produced.

These models will be rougher than the simplified models because of this uniform decimation.

•

You can also select a range file, or part of a range file, and select the Create 3D Popup from Region button to produce quick

models.

DeltaSphere-3000 3D Scene Digitizer

9/23/05