Preview Mesh Specification

Scenomics uses low-resolution preview meshes that serve as a very quick rendition of the terrain much like a sketch or grisaille. This low resolution proxy helps the user ensure their terrain has adequate initial subdivision, correct projection, correct displacement, and correct overlap against ortho-imagery. In the future the preview mesh will also help the user correlate areal, linear, and point features.

Validation

Preview mesh structure not enforced by Scenome during modeling. However since output terrain is derived from a preview mesh, this preview mesh structure is enforced by scripts and commands the user applies to preview meshes. This includes CreateTerrainFromPreviewMesh and SubdividePreviewMesh. The user is free to write their own scripts and commands that do not require such validation but existing commands will not work on invalid meshes. At no time should the user modify the SubdividePreviewMesh script. The user should create a copy of this script if modifications are needed.

Rules Of Conformance

A valid preview mesh must conform to the following rules.

• The container must be a ParametricMeshNode.
• The first modifier must be an ExportOptionsModifier.
• The second modifier must be a TerrainOptionsModifier.
• The third modifier must be a RectangleGeometryModifier.
• The fourth modifier must be a DisplaceModifier.
• The fifth modifier must be a GeographicProjectionModifier.
• The sixth modifier must be a DynamicTextureModifier.
• The seventh modifier must be a CalculateNormalsModifier.
• The modifier count must not exceed or be less than seven.

Parameter validation is not required on any of the modifiers - only on the contents of the mesh construction history itself.

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