[#VWR-1132] Planar mapping on round/spherical prims is very poor/unusable

1. Second Life Viewer - VWR

Planar mapping on round/spherical prims is very poor/unusable

Created: 08/Jun/07 04:49 AM Updated: 17/Sep/07 08:49 AM

Component/s:

Building (in-world)

Affects Version/s:

1.15.1.x, 1.15.0.x, 1.16.0.x, 1.17.0.x, 1.18.0, 1.17.1, 1.18.2.0, 1.18.1.2, 1.18.3 Release Candidate

Fix Version/s:

None

File Attachments:

None

Image Attachments:

1. Planar vs Default mapping.jpg
(74 kb)

Environment:

All

Issue Links:

Duplicate

This issue is duplicated by:

~~VWR-2422~~ Hovering text of in-world objects sometimes disappear after log on.

Relates

This issue is related to by:

WEB-319 add "Not A Bug" resolution to JIRA

Linden Lab Issue ID:

SL-54821

Description

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This has been an issue since before I joined over a year ago, I'm sure. Using Planar mapping on any type of prim other than a cube results in very poorly mapped, stretched, distorted texture mapping.

Steps to reproduce:

* Create a prim, choosing shape type as sphere, cylinder, torus, etc.
* Choose planar mapping, under texture options
* Observe the poor mapping on the round sides of the shape. Tops/bottoms of cylinders are ok but the rest is really badly stretched and uneven in places.

This should be evenly mapped over the entire surface of the shape, so that repeats per meter works correctly and uniformly with repeats per face. This has been a severe hindrance to builders for a long time, costing them time having to manually set the repeats per face to try to match repeats per meter of other shapes.

All

Comments

Change History

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Davey Callisto - 30/Jun/07 01:24 AM

Observe the poor texture mapping when using Planar Mapping

[ Permlink | « Hide ]

Torley Linden - 03/Jul/07 12:45 PM

Removed First Look versions as we're using them to track issues specific to them.

[ Permlink | « Hide ]

Davey Callisto - 10/Jul/07 04:14 AM

This is specific to the first look version. It's also specific to every version of the client, too. No?

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Celierra Darling - 10/Jul/07 02:44 PM

In this case, "specific" means "it only affects that version and nothing else". Sorry for the misunderstanding... :)

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Torley Linden - 12/Sep/07 03:33 PM

Asking Runitai Linden for further insight on this, he coded it.

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Torley Linden - 13/Sep/07 06:06 AM

This is expected behavior. Here's the good word from Runitai (and I learned something new too!):

"That's what planar mapping does on curved surfaces. It's a planar projection onto the prim triangle based on the direction the triangle is facing, so when adjacent triangles are facing different directions, the projection becomes stretched. This is meant as a building aid for aligning textures on flat or nearly flat surfaces only, and to allow you to taper a prim without distorting the texture.

A worthwhile improvement would be to add spherical or cylindrical texture mapping in addition to planar. These projections would work well with curved surfaces."