To do this, the “Import-Export: Import Images as Planes” add-on must be activated in the Blender preferences. The elevation data needs to be imported as a plane. He has published a few more Blender tutorials that I strongly recommend watching too. The following steps in this tutorial follow the YouTube tutorial by Owen Powell. In the following steps, the displacement method will be used to create the 3D model for the map. If you haven’t installed Blender yet, it can be downloaded Here.
How to create a bump map in cheetah 3d how to#
I suggest watching a few videos on how to navigate blender before moving on to the next steps. Finally, the values are converted to integers.Ĭreate a 3D Surface in Blender Using a DEM The condition in this case is IsNull(“DEM”), so where DEM has null values (the flat areas on the “map” where there is no elevation data) a value of 0 is assigned, else the scaled pixel value is assigned. Next the Con function conditionally assigns pixel values. The innermost part (“DEM” – min) / ( max – min ) * ( 65535 – 5000 ) + 5000 scales the pixels from 65535 to 5000 using the min and max values of DEM. Finally, create PNG copies of the two images for use in Blender.ĪrcMap raster calculator expression Int( Con( IsNull( “DEM” ), 0, ( ( “DEM” – min) / ( max – min ) * ( 65535 – 5000 ) + 5000 ) ) ) Before executing the tool, set the processing extent in the environment settings to the extent of the map.
:max_bytes(150000):strip_icc()/bumpmapping-56a012003df78cafda9fec4c.jpg "how to create a bump map in cheetah 3d")
It also maintains a minimum elevation value of 5000 so that the lowest elevations will appear to be elevated above the map in blender. It spreads the elevation values across 16 bit values and replaces null values with 0. Below is a sample expression that will achieve these results using the raster calculator tool in ArcMap. The Final step is to fill the no data cells in the DEM within the extent of the map and stretch the elevation values. In ArcMap this can be achieved by using the resample tool and defining a snap raster in the environment settings.
Next resample either the DEM or the map so that their resolution and pixel alignment match. Therefore flat areas will have DEM values of 0.įirst, georeference the map to align it with the elevation data. Where the map is extruded in Blender will depend on where there are elevation values in the DEM. There are many ways to achieve the necessary results, but the end product must be two images with exactly the same size, resolution, and spatial extent. High resolution DEMs can also be generated from LiDAR point clouds or similar data.Įnsure the DEM and map are the same size and resolution Both the map and DEM used in this tutorial are freely available from the Government of Alberta. DEM images can be downloaded from many sources on the internet such as government open data portals. Then the map image is draped over top of the 3D surface and rendered with realistic lighting.
How to create a bump map in cheetah 3d software#
The software will generate a 3D surface by extruding parts of the image using DEM pixel values as the magnitude of extrusion. Blender can use rasterized elevation data in a similar way to GIS software such as ArcGIS and QGIS. The two images used to create the maps below can be downloaded Here.Ī 3D map can be created in Blender using two images: A map of the area of interest and a digital elevation model (DEM) that covers the area.
By the end of this article you will understand how to: This article is a brief introduction to using Blender to visualize GIS data for those with some GIS and raster manipulation experience. Blender is a versatile open source 3D creation suite that is able to render maps with realistic lighting and textures.
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