| ID | Project | Category | View Status | Date Submitted | Last Update |
|---|---|---|---|---|---|
| 0005224 | DarkRadiant | Map Editing | public | 24.04.2020 12:21 | 25.04.2020 09:52 |
| Reporter | Dragofer | Assigned To | |||
| Priority | normal | Severity | normal | Reproducibility | always |
| Status | confirmed | Resolution | open | ||
| Product Version | 2.8.0 | ||||
| Summary | 0005224: 'Thicken Selected Patches' along vertex normals on a cylinder cap produces deformed shape | ||||
| Description | After the changes in: 0005132: Undo after thickening a cylinder cap along vertex normals causes crash Running "Thicken Selected Patches" along vertex normals on a cylinder cap now produces visible patches, but they're not fully what one would expect: - the 2nd cylinder cap forming the bottom is wedge-shaped instead of flat - the shape isn't symmetrical - 2 patches are used for the side wall, even though 1 would be enough - the texture on the side wall isn't projected correctly Having the option to go in both directions, cylinder <-> cap, would be useful for patch-based building. | ||||
| Steps To Reproduce | 1) Patch -> Create Cylinder -> Cap Selection -> Cylinder -> Ok. This creates a cylinder cap. 2) Deselect everything, select one of the cap patches and move it to somewhere else in the map. 3) Patch -> Thicken Selected Patches -> Extrude along Vertex Normals, 16 units, Create Seams -> Ok. This creates a deformed shape instead of a cylinder. | ||||
| Tags | No tags attached. | ||||
 |
Yes, the thicken algorithm for vertex normals has troubles with that kind of patches, because they have multiple control points located at the same point in space. The algorithm tries to locate neighbouring vertices to calculate the normals, but for vertices sharing the same spot this fails and the normal can't be deduced. I guess in this case it'd be better to select "Extrude along Z-Axis" instead of vertex normals (let alone choosing the Patch > Create Cylinder option to create a cylinder in the first place, but I guess that's not the point here). |
 |
Yeah, I suppose at some point one could expect the mapper to get a little creative, as in try option B if option A doesn't yield the desired result. Extrude along n-axis is perfectly fine for making a cylinder from a cap. |
|
|
It's possible to extend the vertex normals algorithm to try to produce something that is better than this wedge thingy, but the extrusion code is not very beautiful already. I'd rather not make it uglier unless it's really important. |
|
|
I can only really imagine "extrude along normals" getting used if the mapper wants to make a cylinder from a rotated cap, so it's fairly marginal compared to all the other uses he'd have for "extrude along normals". I agree that if it makes the current implementation uglier (and risk compromising the function in other situations) I'd rather put this on the backburner. |
|
|
I'll then leave this issue in status confirmed for the moment being. |
