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Generating Point Objects
Houses, landmarks, and other such objects are placed at certain points of the terrain. There are 2 shape types that can be selected from vector data sources (*.shp and *.geojson assets) and used for point object placement:
- Point — in this case the basic object will be placed at the position specified by the point and will be oriented the same way as when it was saved to a *.node file.
- Line — in this case the basic object will be placed at the position specified by the first point, while the second point determines orientation of object's forward direction vector (positive Y).
This chapter describes the basic workflow for generation of point objects on the terrain.
1. Preparing a Basic Object#
Create a basic object that will be used as a building block for generation — any *.node file containing a single root-node with any hierarchy.
2. Adding a Vector Data Source#
Currently, Sandworm allows using only offline vector data source for generation.
In the Source Data panel, add a new vector data layer.
In the Parameters panel, define the type of Data Source to be used: Assets or External Files. Currently only *.shp and *.geojson are supported as assets. Therefore, if you have other types of files, you can try to add them as External Files.
- In the window that opens, select the set of files to be used as vector data.
When the vector data is added, its image is displayed atop all the layers in the Preview panel (the order of layers display may be changed), and the Vector layer parameters become available.
3. Specifying Tags to Filter Point Objects#
The Tag is in fact a set of rules used to pick the specific data from the list of all available vector data. The rules are created using the Attributes. Only the objects that fit to the requirements of every attribute are generated based on this tag.
Tags are created as follows:
Click the Add button in the Tags window of the Parameters panel.
Double-click on the tag to specify a tag name. To remove a tag use Remove button.
For each tag, set an attribute (or attributes) to filter certain data from the vector source. The required data is filtered using the attribute values and suitable operator. Autocomplete is available. You can type in attribute names and values.
The available operators are: =, !=, >, <, ANY. ANY generates all the objects that have any value assigned for the selected attribute.
You can also select attribute values from the Attributes table. The table opens using the sign on the right of the attribute expression.
To add more attributes, use the "+" (plus) button. You can add as many attributes for one tag as necessary.If several attributes are set, only the data that comply with all the attributes will be selected.
To remove a filter, use the button to the right of the attribute expression.
4. Specifying Parameters of Point Objects#
In this step, we are going to set objects that will be generated and placed across the surface of the terrain according to the data filtered by the tag.
In the Objects window, click Add to add the object that will be generated on the terrain based on the vector data specified for it. The dialog window will open:
Set the following object parameters:
|Name||The object's name, which is displayed in the Objects list in Sandworm and in World Nodes when the terrain is generated.|
|Tag||The tag for the selected object from the list of created tags. In this case, we select Points.|
|Type||Type of the vector object to be generated. In this case, we are generating Points.|
|Enabled||When toggled on, the objects of this type will be generated. When toggled off, the objects of this type are not generated and won't exist in the world containing the generated terrain.|
|Use as Fence||Option for lengthy objects such as fences and pipes.|
|Node||The path to the basic object's *.node file.|
Flag indicating if collisions for the generated object are to be detected.
Available only for geometry type.
|Drop To Ground||Flag indicating if the generated object will be aligned with the terrain surface.|
Distance from the terrain surface along the Z axis, in units.
If you see the generated object partially, You can try to increase this value to lift it above the terrain surface.
|Bake To Cluster||If enabled, bakes generated point objects to Mesh Cluster. If disabled, generated objects are added to the world hierarchy as NodeReferences.|
|Forward Axis||Axis which determines orientation of the basic object: X, -X, Y, -Y.|
|Split Billboards Length (km)||
This parameter is required if your basic object is a billboard in order to control the number of Billboards objects to be generated due to area splitting:
The maximum number of billboards contained in a single Billboards object is limited to 8000. Thus, the number of generated Billboards objects is also affected by the total number of points, where the Billboards are to be placed. Although Billboards are performance-friendly, generating too many of them may reduce performance.
If you introduce any changes into created objects, click Apply to update them immediately.
5. Generating Point Objects#
Here is a terrain fragment with houses generated on the basis of vector data using the basic mesh object.