[QGIS-Developer] Problems with QGIS 3 Hillshade

[C Hamilton]

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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