# Advice for high-quality anti-aliased lines + volume rendering

**URL:** https://discourse.vtk.org/t/advice-for-high-quality-anti-aliased-lines-volume-rendering/2141
**Category:** Support
**Created:** [November 25, 2019, 1:35pm UTC](https://discourse.vtk.org/t/advice-for-high-quality-anti-aliased-lines-volume-rendering/2141 "2019-11-25T13:35:34Z")
**Posts on this page:** 1
**Showing post:** 3

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### Author: ![estan](https://discourse.vtk.org/user_avatar/discourse.vtk.org/estan/32/460_2.png) [@estan](https://discourse.vtk.org/u/estan)
#### Post date: [November 26, 2019, 6:57am UTC](https://discourse.vtk.org/t/advice-for-high-quality-anti-aliased-lines-volume-rendering/2141/3 "2019-11-26T06:57:47Z")

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Hi Allison,

At some angles it looks OKish:

![okayish](https://discourse.vtk.org/uploads/default/original/2X/3/37723202cddf84ca79feb18c4535a869aa0d2180.png)

It’s certainly better than no AA:

![no-aa](https://discourse.vtk.org/uploads/default/original/2X/0/013a9d51a0c0b4ae35ab776a09556aa16d0b0992.png)

It’s just that at some angles it looks a bit ragged like in my first post.

The render window has an alpha channel for sure, because we’re using transparent polydatas. Here’s the printout:

```auto
vtkGenericOpenGLRenderWindow (0x1f5f0f0)
  Debug: Off
  Modified Time: 2961
  Reference Count: 3
  Registered Events: 
    Registered Observers:
      vtkObserver (0x1f2a6d0)
        Event: 91
        EventName: WindowIsCurrentEvent
        Command: 0x1f5ea30
        Priority: 0
        Tag: 2
      vtkObserver (0x1f8e060)
        Event: 92
        EventName: WindowFrameEvent
        Command: 0x1f5ea30
        Priority: 0
        Tag: 3
      vtkObserver (0x1f8e100)
        Event: 3
        EventName: StartEvent
        Command: 0x1f5ea30
        Priority: 0
        Tag: 4
      vtkObserver (0x1f8d780)
        Event: 8
        EventName: StartPickEvent
        Command: 0x1f5ea30
        Priority: 0
        Tag: 5
      vtkObserver (0x1f8e240)
        Event: 8
        EventName: StartPickEvent
        Command: 0x1f5ea30
        Priority: 0
        Tag: 6
      vtkObserver (0x1f2a700)
        Event: 51
        EventName: CursorChangedEvent
        Command: 0x1f5ea30
        Priority: 0
        Tag: 7
      vtkObserver (0x201fd70)
        Event: 90
        EventName: WindowMakeCurrentEvent
        Command: 0x1f5ea30
        Priority: 0
        Tag: 1
  Erase: On
  Window Name: Visualization Toolkit - OpenGL
  Position: (0, 0)
  Size: (0, 0)
  Mapped: 0
  OffScreenRendering: 0
  Double Buffered: 1
  DPI: 72
  TileScale: (1, 1)
  TileViewport: (0, 0, 1, 1)
  Borders: On
  IsPicking: Off
  Double Buffer: On
  Full Screen: Off
  Renderers:
    Debug: Off
    Modified Time: 2964
    Reference Count: 1
    Registered Events: (none)
    Number Of Items: 2
  Stereo Capable Window Requested: No
  Stereo Render: Off
  Point Smoothing: Off
  Line Smoothing: Off
  Polygon Smoothing: Off
  Abort Render: 0
  Current Cursor: 0
  Desired Update Rate: 0.0001
  In Abort Check: 0
  NeverRendered: 1
  Interactor: 0x1d4eaf0
  Swap Buffers: On
  Stereo Type: RedBlue
  Number of Layers: 2
  AccumulationBuffer Size 0
  AlphaBitPlanes: On
  UseSRGBColorSpace: Off
  AnaglyphColorSaturation: 0.65
  AnaglyphColorMask: 4 , 3
  MultiSamples: 8
  StencilCapable: False
  DefaultFrameBufferId: 0

```

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_[View the full topic](https://discourse.vtk.org/t/advice-for-high-quality-anti-aliased-lines-volume-rendering/2141)._