A heightmap based on a 2d grayscale image. URI to a grayscale image file The size of the heightmap in world units. When loading an image: "size" is used if present, otherwise defaults to 1x1x1. When loading a DEM: "size" is used if present, otherwise defaults to true size of DEM. A position offset. The heightmap can contain multiple textures. The order of the texture matters. The first texture will appear at the lowest height, and the last texture at the highest height. Use blend to control the height thresholds and fade between textures. Size of the applied texture in meters. Diffuse texture image filename Normalmap texture image filename The blend tag controls how two adjacent textures are mixed. The number of blend elements should equal one less than the number of textures. Min height of a blend layer Distance over which the blend occurs Set if the rendering engine will use terrain paging Samples per heightmap datum. For rasterized heightmaps, this indicates the number of samples to take per pixel. Using a lower value, e.g. 1, will generally improve the performance of the heightmap but lower the heightmap quality.