Rectify wall rasters

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Rectify wall rasters

Rectify wall rasters

Rectify wall rasters command starts the production of wall texture files. Wall textures can be created from oblique images from an airborne system or from side-looking images from a ground-based mobile system. The textures are created as raster files which are used when a view is rendered with Display Rendered View tool in TerraPhoto. In addition, MicroStation material table and palette files can be created in order to use the wall textures for MicroStation rendering.

The process requires the selection of 3D building vector models prior to starting the command. The vector models can been created, for example, with TerraScan tools for building vectorization.

The software decides what image to use for a wall polygon based on the viewing direction and percentage of wall area seen by the image. Depth maps created in TerraPhoto can support the creation of wall textures. See Compute depth maps for more information about depth maps.

To create wall textures:

1. Use MicroStation Selection tool in order to select 3D vector models of buildings.

2. Select Rectify wall rasters command from the Rectify pulldown menu.

This opens the Rectify wall rasters dialog:

rectify_wall_rasters

3. Define settings and click OK.

This starts the rectification process. The software produces raster file(s) for each selected wall polygon.

4. Save the design file and the design file settings in order to save the references to the wall raster files.

SETTING

EFFECT

Use images

Raw images to use: All images or Selected. Alternatively, the name of one camera can be selected from which to use the images.

Each polygon from

Defines the amount of images that are used for creating a texture for a wall polygon:

Only one image - the best image is used.

Upto two|three|four best - up to two|three|four best images are used.

Any number of images - any amount of images can be used.

Minimum area

Smallest wall area for which the software creates a texture file.

Require

Minimum percentage of a wall polygon that an image must cover in order to be considered for texture creation.

Pixel size

Pixel size of the wall textures.

Format

Raster file format to produce: BMP, JPG, or TIFF.

Depth maps

Method of using depth maps in the rectification process:

Do not use - depth maps are not used.

Image selection - the best image(s) are used even if there are obstructing objects in the image(s).

Selection and obstruction - an image is not used if there are obstructing objects in the image. This may result in blank areas for walls.

Tolerance

Distance from a wall in depth maps within which objects in front of the wall are ignored. This is only active if Depth maps are used.

Raster directory

Directory for storing the wall texture files on a hard disk.

Name prefix

Text to add before an increasing number for naming the wall texture file.

Modify element color

If on, the color of the wall shape in the 3D model is changed to the average color of the texture pixels.