[Bf-viewport] Updates for the week of April 11th - April 18th

[Mike Erwin]

This is a list of topics that each need to be expanded and discussed,
*then* they will become concrete tasks.

The single-pass barycentric wireframe approach is a good place to start! It
fits within this topic:
- mixed drawing: wires atop surfaces

Complaints & discussion about our current approach:
https://developer.blender.org/T44505

nVidia implementation:
http://developer.download.nvidia.com/SDK/10/direct3d/Source/SolidWireframe/Doc/SolidWireframe.pdf

>From the technique's original authors:
http://www2.imm.dtu.dk/pubdb/views/edoc_download.php/4884/pdf/imm4884.pdf
http://www.imm.dtu.dk/~janba/Wireframe/Siggraph06.pdf

>From the authors' "Issues" slide:
• The method does not support indexed geometry
• Primitive/geometry shaders alleviate this!
• Silhouette edges drawn from one side only
• Only noticeable on small meshes
• This is essentially a method for triangles and quadrilaterals
• yes – but that is a very common special case

Several years of GPU progress has helped us though! Geometry shaders and
noperspective interpolation can be used.

But how can we use this to draw only the exterior edges of n-gons? Or draw
the interior edges (from triangulation) in a different style? Need to work
out those details.

Mike Erwin
musician, naturalist, pixel pusher, hacker extraordinaire

On Tue, Apr 19, 2016 at 3:49 AM, Alexander Romanov <a.romanov at blend4web.com>
wrote:

> Some tasks overlap with the tasks from this page
> https://wiki.blender.org/index.php/Dev:2.8/Source/OpenGL/Shaders . May be
> it makes sense to have a single list?
> And Just about wireframes. There is a good approach described here
> http://codeflow.org/entries/2012/aug/02/easy-wireframe-display-with-barycentric-coordinates/
> . Also, I have already thought about flat shading, so I can pick this two
> tasks for the near future.
>
>
> On 19.04.2016 08:31, Mike Erwin wrote:
>
> For the upcoming week:
>
> I've been writing up some Viewport 2.8 ideas / docs / designs and will
> share these very soon. Initially it will be "what merwin thinks", but
> should give us something to talk about and arrive at "what Blender folks
> think". And then on to planning & actions & great success.
>
> Here's a list of topics from my notebook -- I can pick 3 or 4 to expand on
> by next week, prioritized by your responses. A lot of these get into
> technical details, but always important is the idea that the visuals should
> support and enhance the task at hand.
>
> - fundamental drawing styles:  surface (full materials), shape/form
> (solid, matcap), structure (polygons)
> - wireframes!
> - selection outlines, indication
> - mixed drawing: wires atop surfaces
> - how to combine techniques -- material + nice outlines + screen door
> stippling for example
> - matrix stacks
> - state setting, AKA "revenge of glLineWidth"
> - immediate-mode-style drawing
> - building draw batches -- GAWAIN
> - splitting draw batches -- by material, for low VRAM systems, etc.
> - batch caching, animation
> - supported systems & GPUs
> - OpenGL & Vulkan roadmap
> - partial updates / dirty normals
> - GPU data request -- shader/technique declares what it needs
> - OpenSubdiv enhancements needed
> - reflection / env maps / image based lighting
> - real-time shadows
> - image & texture enhancements needed
> - material enhancements needed
> - Blender --> Unreal pipeline
> - Blender --> [your favorite engine] pipeline
>
> Mike Erwin
> musician, naturalist, pixel pusher, hacker extraordinaire
>
> On Mon, Apr 18, 2016 at 1:45 PM, Mitchell Stokes <mogurijin at gmail.com>
> wrote:
>
>> Hello devs,
>>
>> Any interesting viewport updates for the week of April 11th to April
>> 18th? Any plans for the upcoming week? I will be aggregating information on
>> the Viewport Reports wiki page[1].
>>
>> Thanks,
>> Mitchell Stokes
>>
>> [1] https://wiki.blender.org/index.php/Dev:2.8/Viewport/Reports
>>
>> _______________________________________________
>> Bf-viewport mailing list
>> Bf-viewport at blender.org
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>>
>>
>
>
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>
>
> --
> Alexander Romanov (Blend4Web Team)
>
>
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