This node creates a terrain from an image file. The image is transformed into gray levels, each pixel having a value between 0 and 1. The generated terrain has the resolution of the image as its size, and the height of each point depends on its gray level and the scale of the heights (vertices with a 0 value will have their height set to the min value, and vertices with a 1 value will have their height set to the max value).
To add a node, right-click in the Graph Editor and select Create Node > Import > Import terrain from file.
Double click on the node to open its parameters:
To import a terrain from a file:Either:
File names with Unicode characters are supported.
If you have already saved your project, type just a file name or sub-directory and file name to import it from the same directory as your project. There is no need to type the file directory.
The following image formats are supported:
|.bmp||Windows or OS/2 Bitmap file||8/16/24/32 bits allowed|
|.dem||Digital Elevation Model|
|.gif||Graphics Interchange Format|
|.jpg, .jpeg||Independent JPEG Group|
|.png||Portable Network Graphics||8/16 bits per channel with 1/3/4 channels (gray scale/RGB/RGBA) allowed|
|.tif, .tiff||Tagged Image File Format||8/16/32 bits allowed|
|.tga||Truevision Targa File|
|.raw||RAW binary data|
|.asc||ARC/INFO ASCII GRID|
Every heightmap used for a terrain may contain colors or an alpha channel. Both are converted to gray scale values.
Only nodes with a single channel, 8 bits, 16
bits, or 32 bits, are supported.
- For 8 bits, the values are between 0 and 255.
- For 16 bits, the values are between 0 and 65'535.
- For 32 bits, the values are floating values: for a terrain, this is the height of the terrain.
In some cases Instant Terra can detect these missing parts. In this case, the Fix missing regions option is available.
When the option is checked, the missing parts are set to zero altitude, which leads to a better result. Here is the same terrain when the option Fix missing regions is checked.
Tip: When a terrain from satellite data
presents a part located at a very low altitude and the Fix
missing regions option is not available or does not give a
satisfactory result, you can use a node Min & max heights node
in Clamp mode with a minimum height of zero to
obtain a similar result.
The Fix missing region option is only available for 16-bit formats that accept negative values (INT16 format). In this case, a missing region is often indicated by values equal to -32,768. Instant Terra detects these values and replaces them with a value corresponding to an altitude of zero.
|File name||Name of the file to load|
|Quad size||Size of the terrain quads|
|File information||Shows the width, height, and bits of the terrain|
|Height||Sets the minimum and maximum height of the terrain|
|Flip Y axis||Flips the terrain around the Y axis|
|Fix missing regions||Sets the missing parts of imported satellite data to zero|
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