From 1ee773a5322ff08fbf0204b995e6be06fad25066 Mon Sep 17 00:00:00 2001
From: Seth Alves <seth.alves@gmail.com>
Date: Sun, 16 Aug 2015 14:11:37 -0700
Subject: [PATCH] don't include interrior voxels in cubic collision hull

---
 .../src/RenderablePolyVoxEntityItem.cpp              | 12 ++++++++++++
 1 file changed, 12 insertions(+)

diff --git a/libraries/entities-renderer/src/RenderablePolyVoxEntityItem.cpp b/libraries/entities-renderer/src/RenderablePolyVoxEntityItem.cpp
index 7044eb0b3c..edccffd397 100644
--- a/libraries/entities-renderer/src/RenderablePolyVoxEntityItem.cpp
+++ b/libraries/entities-renderer/src/RenderablePolyVoxEntityItem.cpp
@@ -695,6 +695,18 @@ void RenderablePolyVoxEntityItem::computeShapeInfo(ShapeInfo& info) {
             for (int y = 0; y < _voxelVolumeSize.y; y++) {
                 for (int x = 0; x < _voxelVolumeSize.x; x++) {
                     if (getVoxel(x, y, z) > 0) {
+
+                        if ((x > 0 && getVoxel(x - 1, y, z) == 0) &&
+                            (y > 0 && getVoxel(x, y - 1, z) == 0) &&
+                            (z > 0 && getVoxel(x, y, z - 1) == 0) &&
+                            (x < _voxelVolumeSize.x - 1 && getVoxel(x + 1, y, z) == 0) &&
+                            (y < _voxelVolumeSize.y - 1 && getVoxel(x, y + 1, z) == 0) &&
+                            (z < _voxelVolumeSize.z - 1 && getVoxel(x, y, z + 1) == 0)) {
+                            // this voxel has neighbors in every cardinal direction, so there's no need
+                            // to include it in the collision hull.
+                            continue;
+                        }
+
                         QVector<glm::vec3> pointsInPart;
 
                         float offL = -0.5f;