Steps To Reproduce

• Under Preferences -> Graphics, make sure Advanced Lighting Model is enabled.

• Under World -> Sun, set Sun to Midnight to show the effect more easily.

• Rez a box, stretch it quite large.

• Edit box -> Features -> Tick Light.

• Click thumbnail to set a projected texture -> Choose "Blank" in the texture picker.

• Angle the box so the projected light falls onto your avatar.

• Purchase this hair: https://marketplace.secondlife.com/p/Magika-DEMO-Dusty/5118388

• Wear hair and change hair to a light colour to show the problem easily - my attached image (Fig 1) is using HUD 02 colour 2.

• Rez a couple more boxes and set transparency on one box to be 1%. Position boxes so that the projected light is falling on them.

• Edit the projector box -> Features -> Change Ambiance setting from 0.000 to 1.000

  Observed Behaviour

• When Ambiance is 0.000 (default setting) the hair colour is the same on the parts that have transparency in the texture and the parts that have no transparency.

• When Ambiance is 0.000 both boxes are lit the same way by the projected light.

  

• When Ambiance is 1.000 the hair colour on the parts that have transparency in the texture render much darker then the parts that have no transparency.

• When Ambiance is 1.000 the box set at 1% transparency appears not to be lit at all by the projected light and the box with no transparency is lit very brightly.

  

  Expected Behaviour

  There should not be such a large discrepancy between the way textures containing transparency and textures that don't contain transparency are lit by a projected light with a high ambiance setting

Attachments

• Fig 1 Hair.png 2014-04-25 02:00:48
• Fig 2.png 2014-04-25 02:30:12

Links

Duplicates

• [BUG-9662] Blended alpha textures are not lit by ambient light from projectors #17138
• [BUG-10385] Textures with an Alpha-channel are shaded very dark at night #717
• [BUG-226240] Alphablend reacts to ambient light more intensely then not-alpha-blend. #4831
• [BUG-227395] Rigged Mesh using alpha texture appear full bright #5693

Related

• [BUG-226240] Alphablend reacts to ambient light more intensely then not-alpha-blend. #4831

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  'Business Unit': ['Platform'],
  'Date of First Response': '2015-10-05T01:41:36.653-0500',
  'System': 'SL Viewer',
  'Target Viewer Version': 'viewer-development',
  'What just happened?': '.',
  'What were you doing when it happened?': 'Filling in',
  'What were you expecting to happen instead?': '.',
}