m42239/geometry: fix missing neighbourhood check for idcm eligibility

The original integration of IDCM implemented only the parent based eligibility check of m42239 and erroneously omitted the six-neighbour check. This commit adds the six-neighbour check, making use of the neighbour calculation from m42239 neighbour contextualised coding of occupancy.

m42239/geometry: fix missing neighbourhood check for idcm eligibility
The original integration of IDCM implemented only the parent based eligibility check of m42239 and erroneously omitted the six-neighbour check. This commit adds the six-neighbour check, making use of the neighbour calculation from m42239 neighbour contextualised coding of occupancy.
1cd9938e · David Flynn · c4cd4b27 · 1cd9938e
Commit 1cd9938e authored Jun 22, 2018 by David Flynn
--- a/tmc3/PCCTMC3Common.h
+++ b/tmc3/PCCTMC3Common.h
@@ -323,7 +323,7 @@ isDirectModeEligible(
  bool featureEnabled,
  int nodeSizeLog2, const PCCOctree3Node& node, const PCCOctree3Node& child
 ) {
-  return featureEnabled && (nodeSizeLog2 >= 2)
+  return featureEnabled && (nodeSizeLog2 >= 2) && (node.neighPattern == 0)
      && (child.numSiblingsPlus1 == 1) && (node.numSiblingsPlus1 <= 2);
 }