[Bf-viewport] Rendering to a cubemap

[Clément FOUCAULT]

@Mike : Yes this is exactly what I want. I want to render light probes to a
cubemap. First, only the environement, then we will find a way to render
the probe from and object location.

I'll explain how i'm seing things:
- A global cubemap/lightprobe (whatever you want to call it) containing
only environment. > Applied by default to all shaders who need it (who have
bsdfs inside their tree)
- An Object option to create a local cubemap/lightprobe for the shaders
this object uses. > only switch the cubemap to send to the sampling
algorithm (local instead of global). This one should have the others
objects in it and provide better reflections. The Options for this could
include (realtime update (would be very slow), generate cubemap button,
cubemap resolution, use another object's cubemap (to save memory) )
And i'm not sure but for a game engine integration the method I use ATM is
very slow (sampling 32 times). So implementing a prefilter option would be
needed later.

@Jacob : I meant to do it in "realtime" inside the blender code :)

2016-01-23 19:16 GMT+01:00 Jacob Merrill <blueprintrandom1 at gmail.com>:

> I can do it in blender internal, but not cycles right now.
>
> environment maps you can save the output from (this is a cube map no?)
>
> On Sat, Jan 23, 2016 at 10:10 AM, Mike Erwin <significant.bit at gmail.com>
> wrote:
>
>> So essentially a way to make reflection probes, also light probes for
>> image-based lighting. Is that over-simplifying?
>>
>> Mike Erwin
>> musician, naturalist, pixel pusher, hacker extraordinaire
>>
>> On Sat, Jan 23, 2016 at 12:13 PM, Clément FOUCAULT <
>> foucault.clem at gmail.com> wrote:
>>
>>> Hi there i'm clément foucault the dev who brought to you the PBR branch
>>>
>>> http://www.clement-foucault.com/#blender_pbr
>>>
>>> I'm making progress with features but one things that limits me is the
>>> sampling of the environment.
>>> For now I am plugging the world node tree inside each shader that
>>> contains a brdf node and sample inside the node_shader_gpu_tex_environment
>>> function. This is sub-optimal in numerous ways and not very clean.
>>>
>>> To overcome this I must render the environment world tree result to an
>>> Envmap (Preferably a Cubemap). I need help designing the rendering and the
>>> storing (in memory, not to disk) of such cubemap.
>>>
>>> I've already done a preliminary handling of Cubemap textures inside the
>>> PBR branch V0.1 But I think I never pushed it to github (damn). So I'll be
>>> integrating it inside my 0.2 branch soon. It only handles the uploading of
>>> cubemaps to the gpu not the rendering.
>>>
>>> If anyone knowledgeable in this field could help me I would be very
>>> thankful.
>>>
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>>>
>>>
>>
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>
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