[vtkusers] Changes in diffuse properties of material.
ken.martin at kitware.com
Tue Oct 10 14:30:13 EDT 2017
Cool! Glad it worked out. - Ken
On Tue, Oct 10, 2017 at 2:02 PM, Seun Odutola <seun at rogue-research.com>
> Hi Ken,
> I had to take a closer look at how I was rendering my mesh, it seems
> everything is fine; I was a bit thrown off by the scalar colouring at first
> and couldn’t really understand the need for the change but on further
> scrutiny I figured I had to readjust how I was setting my ambient values.
> On Oct 3, 2017, at 1:42 PM, Ken Martin <ken.martin at kitware.com> wrote:
> You would need to give me a more specific example for me to help. That
> change mostly impacted meshes that use scalar coloring. But in general the
> color on screen is driven by diffuse ambient and specular colors and
> properties make sure those are set to reasonable values.
> Maybe find a mesh where you see an issue and let me know what the
> ambient/diffuse/specular colors and intensities are for the mesh. No
> texturing. No backface properties. No scalar coloring. Maybe go from
> On Tue, Oct 3, 2017 at 1:34 PM, Seun Odutola <seun at rogue-research.com>
>> Hi everyone,
>> I recently discovered whilst working with VTK master that some
>> meshes are completely rendered dark in colour compared to others; meshes
>> that rely on their material (actor’s properties) are mostly affected. I
>> tracked the occurrence of this change down to the following commit below
>> and was wondering the essence of the change, also if need be how can one
>> replicate the previous rendering behaviour.
>> - commit 7bc7e58334bcd1eac12adb6db22d6c45cf8fca74
>> Author: Ken Martin <ken.martin at kitware.com>
>> Date: Thu Aug 31 13:08:58 2017 -0400
>> update handling of scalar material mode
>> Previously scalar material mode when used
>> with scalars would ignore the ambient and diffuse
>> material intensities and when mapping one of them
>> set that one to 1.0 while leaving th eother alone.
>> This caused lots of odd situations where objects would be
>> over illuminated etc or where changing the diffuse or
>> ambient seemed to have o impact.
>> With this change the diffuse and ambient intensities
>> are always used. The sclaar simply controls the color
>> not the intensity.
> Ken Martin PhD
> Distinguished Engineer
> Kitware Inc.
> 28 Corporate Drive
> Clifton Park NY 12065
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Ken Martin PhD
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