DeltaSphere-3000 3D Scene Digitizer
6
9/23/05
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.)
o
When you’ve named them all the processing will begin. Go home. Full scans can take 45 minutes each – or more.
o
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.
o
If you want to keep this ‘merged’ file you need to save it with
Save File
or
Save File As
in the File menu.
o
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.
o
Select two models and then
Create Model from Selected Data
. Save the resulting model.
o
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
•
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.
•
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:
o
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.
o
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.
o
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.
o
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.
