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<p>Hi,</p>
<p>I was looking for a solution to retrieve a 3D extent (in my case from a gpkg). Currently, the OGR_L_GetExtent function uses an OGREnvelope and when I pass a OGREnvelope3D parameter, it does not fill the Z fields. </p>
<p>What should be the best approach to the minZ and maxZ for a layer?</p>
<p>Regards.
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