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heightfield collision shapes don't match TerrainQuad #1125

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stephengold opened this issue Jun 17, 2019 · 1 comment
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heightfield collision shapes don't match TerrainQuad #1125

stephengold opened this issue Jun 17, 2019 · 1 comment
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@stephengold
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defect Something that is supposed to work, but doesn't. Less severe than a "bug" Physics Issues with all kinds of Physics and their Bindings
Milestone
v3.2.4

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@stephengold
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stephengold commented Jun 17, 2019 •
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Create a TerrainQuad and then generate a CollisionShape from it using CollisionShapeFactory. The diagonals of the mesh will run one direction, and the diagonals of the HeightfieldCollisionShape grid will run the other direction. This is most noticeable for small heightfields (2x2, ideally) with large differences in height between adjacent grid points.

An easy workaround would be to set flipQuadEdges = true in HeightfieldCollisionShape.createCollisionHeightfield(), but unfortunately there's no mechanism to do this in jMonkeyEngine.

The issue is present in current master-branch jme3-bullet; I haven't tested jme3-jbullet yet.
stephengold added a commit that referenced this issue Jun 18, 2019
@stephengold
add test for issue #1125 (heightfield shapes don't match TerrainQuad)
df02333
@stephengold stephengold self-assigned this Jun 18, 2019
stephengold added a commit that referenced this issue Jun 18, 2019
@stephengold
jme3-bullet fix for issue #1125 (physics shapes don't match TerrainQuad)
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I verified the fix using TestIssue1125.java and jme3-bullet. I still don't know whether jme3-jbullet has this issue or not. If it does, either re-open this issue or open a new issue.

@stephengold stephengold modified the milestones: v3.3.0, v3.2.4 Jun 19, 2019
stephengold added a commit that referenced this issue Jul 10, 2019
@stephengold
add test for issue #1125 (heightfield shapes don't match TerrainQuad)
200714e
stephengold added a commit that referenced this issue Jul 10, 2019
@stephengold
jme3-bullet fix for issue #1125 (physics shapes don't match TerrainQuad)
db89c64
@stephengold stephengold added the defect Something that is supposed to work, but doesn't. Less severe than a "bug" label Sep 19, 2019
@stephengold stephengold added the Physics Issues with all kinds of Physics and their Bindings label Feb 19, 2020
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defect Something that is supposed to work, but doesn't. Less severe than a "bug" Physics Issues with all kinds of Physics and their Bindings
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Milestone
v3.2.4
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