SCNNode static body with .dae causing issues

问题

I have built a landscape model in blender, exported to .dae and added to my xcode project.

I have loaded the scene then attached the child (landscape grid mesh) to my landscapeNode, this loads perfectly.

However when I attach a static physics body to the landscspeNode my heroNode seems to crash into a invisible wall when attempting to fly above the land.

The functionality I am looking for is the obvious collision with the land I have modelled so the heroNode cannot fly through the land and is forced to move around it.

Note: I did not do any converting of the y axis in blender nor xcode just simply rotated the node 90degrees about the -x axis.

Edit: code i've attempted to add physics shape

landscapeNode.physicsBody = [SCNPhysicsBody bodyWithType:SCNPhysicsBodyTypeStatic shape:[SCNPhysicsShape shapeWithNode: [landscapeScene.rootNode childNodeWithName:@"Grid" recursively:NO] options:@{SCNPhysicsShapeTypeKey:SCNPhysicsShapeTypeConcavePolyhedron}]];

landscapeNode.physicsBody = [SCNPhysicsBody bodyWithType:SCNPhysicsBodyTypeStatic shape:[SCNPhysicsShape shapeWithNode: landscapeNode options:@{SCNPhysicsShapeTypeKey:SCNPhysicsShapeTypeConcavePolyhedron}]];

landscapeNode.physicsBody = [SCNPhysicsBody bodyWithType:SCNPhysicsBodyTypeStatic shape:[SCNPhysicsShape shapeWithGeometry: landscapeNode.geometry options:@{SCNPhysicsShapeTypeKey:SCNPhysicsShapeTypeConcavePolyhedron}]];

回答1:

If you don't specify additional options when creating a physics body for a node, what you get is a convex hull encompassing that node's geometry.

Because your landscape is a static body, you can make it use a concave shape that more closely approximates the geometry. (Note that this works only for static bodies.) To do this, you'll need to:

1. Use the bodyWithShape:type: method to create the body, not staticBody.
2. For that method you need to pass an SCNPhysicsShape. Create one with shapeWithGeometry:options: or shapeWithNode:options:.
3. For the options parameter, pass a dictionary containing the key SCNPhysicsShapeTypeKey and corresponding value SCNPhysicsShapeTypeConcavePolyhedron.

来源：https://stackoverflow.com/questions/27503183/scnnode-static-body-with-dae-causing-issues