OS: Windows 7 QGIS 3.0.3 I have encountered several issues with the Hillshade algorithm in QGIS 3.
1. It is much slower that the QGIS 2 hillshade perhaps as much as 10x slower. This is a problem because I process very large images. 60,000 x 80,000 pixels or greater. I eventually killed the process and went back to QGIS 2 to complete the job. 2. I tried using Multidirectional shading and received an error. This is basically the command issued. gdaldem hillshade input.tif output.tif -of GTiff -b 1 -z 1.0 -s 1.0 -az 315.0 -alt 45.0 -multidirectional I get the gdal error "ERROR 6: -multidirectional and -az cannot be used together". If multidirectional is enabled then you cannot add the -az parameter. If have tried running the same command in the command line and removed the -az and it worked fine. Calvin Hamilton
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