[osg-users] 32bit DEPTH for RTT
Trajce Nikolov NICK
trajce.nikolov.nick at gmail.com
Thu Oct 20 08:00:00 PDT 2016
Thanks Glenn,
actually I was expecting this. I have the math to get the light direction
in view space, just the construction of the light matrix in view space
hurts my head a bit ( I missed that part of the class :-) )
vec3 lightDirInViewSpace;
vec3 lightPosInViewSpace;
mx.makeLookAt(lightPosInViewSpace,lightPosInViewSpace+lightPosInViewSpace,up)
Something like this?
On Thu, Oct 20, 2016 at 4:04 PM, Glenn Waldron <gwaldron at gmail.com> wrote:
> There's your precision loss, you can't do that with ECEF coordinates or
> they will be truncated.
>
> Better idea: build your light matrix in view space on the CPU (instead of
> world space), and then use it on the view-space vertex in the shader.
> (You'll have to update it every time the camera moves, of course.)
>
>
> Glenn Waldron
>
> On Thu, Oct 20, 2016 at 10:00 AM, Trajce Nikolov NICK <
> trajce.nikolov.nick at gmail.com> wrote:
>
>> Hi Glenn,
>>
>> vec3 vVertex = vec3(gl_ModelViewMatrix * VertexMODEL);
>> worldSpaceVertex = osg_ViewMatrixInverse * vec4( vVertex, 1.0 );
>>
>> Part of VP
>>
>> On Thu, Oct 20, 2016 at 3:52 PM, Glenn Waldron <gwaldron at gmail.com>
>> wrote:
>>
>>> Nick, how did you calculate "worldSpaceVertex"?
>>>
>>> Glenn Waldron
>>>
>>> On Thu, Oct 20, 2016 at 9:13 AM, Trajce Nikolov NICK <
>>> trajce.nikolov.nick at gmail.com> wrote:
>>>
>>>> hehe .. ok :-) .. Maybe you give me a hint.
>>>>
>>>> I have F+ lighting (written by a friend of mine) and I have extended it
>>>> so local lights cast shadows (a bit of complex code - relatively actually,
>>>> but for me it is ;-) ). Works well for flat terrains with reasonable sizes.
>>>> I am trying to make it work with ECEF terrain (for testing I use osgearth).
>>>> The debug code works just fine, I am seeing the renderings from the local
>>>> lights are correct, so the light view matrix passed to the shader is
>>>> correct, but getting z-fights with setInternalFormat(GL_DEPTH_COMPONENT);
>>>> only. Here is my setup for the RTT (it is texturearray):
>>>>
>>>> http://pastebin.com/Nnc2iA1F
>>>>
>>>> With DEPTH32bit (really naive approach, I "was" thinking fast the
>>>> increase of the DEPTH precision will solve this issue, just recently
>>>> started with reading papers and I must admit I am not a "shadowing expert").
>>>>
>>>> Further, I am calculating the Light View Matrix and passing it to the
>>>> shader - this one is correct as well, since I am seeing the light in the
>>>> scene with the z artifacts as I mentioned .... and this is my GLSL snippet:
>>>>
>>>> http://pastebin.com/r2W0gh0L
>>>>
>>>> I am trying to get it done as simple as is ... meanwhile found this:
>>>>
>>>> http://developer.download.nvidia.com/SDK/10/direct3d/Source/
>>>> VarianceShadowMapping/Doc/VarianceShadowMapping.pdf
>>>>
>>>> that looks promising and apparently should help with the Z issues.
>>>>
>>>> This is my story for now, any hints are highly appreciated !!!!!
>>>>
>>>> And thanks a bunch for so far!
>>>>
>>>> Cheers,
>>>>
>>>> On Thu, Oct 20, 2016 at 2:56 PM, Voerman, L. <l.voerman at rug.nl> wrote:
>>>>
>>>>> yes?
>>>>> we use a variation on OpenSceneGraph\src\osgShadow\P
>>>>> arallelSplitShadowMap.cpp
>>>>> regards, Laurens.
>>>>>
>>>>> On Thu, Oct 20, 2016 at 2:35 PM, Trajce Nikolov NICK <
>>>>> trajce.nikolov.nick at gmail.com> wrote:
>>>>>
>>>>>> Hi Laurens,
>>>>>>
>>>>>> do you have experience with DEPTH32bit and shadowcomparation set to
>>>>>> true - for shadow mapping?
>>>>>>
>>>>>> On Thu, Oct 20, 2016 at 12:08 PM, Trajce Nikolov NICK <
>>>>>> trajce.nikolov.nick at gmail.com> wrote:
>>>>>>
>>>>>>> Hi Voerman,
>>>>>>>
>>>>>>> Yes, GL_DEPTH_COMPONENT32 was what I was missing ... Thanks a lot!
>>>>>>>
>>>>>>> Trajce
>>>>>>>
>>>>>>> On Thu, Oct 20, 2016 at 9:25 AM, Voerman, L. <l.voerman at rug.nl>
>>>>>>> wrote:
>>>>>>>
>>>>>>>> Hi Trajce,
>>>>>>>> maybe this sniplet helps?
>>>>>>>> _textureDepthBuffer = new osg::Texture2D;
>>>>>>>> _textureDepthBuffer->setTextureSize(_width+2.0f*_width*_guardBandPercentage,
>>>>>>>> _height+2.0f*_height*_guardBandPercentage);
>>>>>>>> _textureDepthBuffer->setSourceFormat(GL_DEPTH_COMPONENT);
>>>>>>>> _textureDepthBuffer->setInternalFormat(GL_DEPTH_COMPONENT32);
>>>>>>>> _textureDepthBuffer->setFilter(osg::Texture2D::MIN_FILTER,os
>>>>>>>> g::Texture2D::NEAREST);
>>>>>>>> _textureDepthBuffer->setFilter(osg::Texture2D::MAG_FILTER,os
>>>>>>>> g::Texture2D::NEAREST);
>>>>>>>> _textureDepthBuffer->setShadowComparison(false);
>>>>>>>> _textureDepthBuffer->setWrap(osg::Texture::WRAP_R,osg::Textu
>>>>>>>> re::CLAMP_TO_EDGE);
>>>>>>>> _textureDepthBuffer->setWrap(osg::Texture::WRAP_S,osg::Textu
>>>>>>>> re::CLAMP_TO_EDGE);
>>>>>>>>
>>>>>>>> // camera
>>>>>>>> _colorDepthCamera = new osg::Camera;
>>>>>>>> _colorDepthCamera->setStats(new osg::Stats("Camera"));
>>>>>>>> _colorDepthCamera->setName("colorDepth");
>>>>>>>> _colorDepthCamera->setClearMask(GL_COLOR_BUFFER_BIT |
>>>>>>>> GL_DEPTH_BUFFER_BIT);
>>>>>>>> _colorDepthCamera->setReferenceFrame(osg::Transform::RELATIVE_RF);
>>>>>>>> // set viewport
>>>>>>>> _colorDepthCamera->setViewport(0,0,_width+2.0f*_width*_guard
>>>>>>>> BandPercentage,_height+2.0f*_height*_guardBandPercentage);
>>>>>>>> _colorDepthCamera->setRenderOrder(osg::Camera::PRE_RENDER,0);
>>>>>>>> _colorDepthCamera->setRenderTargetImplementation(osg::Camera
>>>>>>>> ::FRAME_BUFFER_OBJECT);
>>>>>>>> _colorDepthCamera->attach(osg::Camera::DEPTH_BUFFER,
>>>>>>>> _textureDepthBuffer.get(),0,0,false,0,0); // depth
>>>>>>>> _colorDepthCamera->attach(osg::Camera::COLOR_BUFFER,
>>>>>>>> _textureColorBuffer.get(),0,0,false,_msaa,_msaa); // color
>>>>>>>> regards, Laurens.
>>>>>>>>
>>>>>>>> On Wed, Oct 19, 2016 at 11:15 PM, Trajce Nikolov NICK <
>>>>>>>> trajce.nikolov.nick at gmail.com> wrote:
>>>>>>>>
>>>>>>>>> Hi Community,
>>>>>>>>>
>>>>>>>>> anyone with clue how to set RTT osg::Texture with 32bit DEPTH?
>>>>>>>>>
>>>>>>>>> Thanks a bunch as always!
>>>>>>>>> Cheers,
>>>>>>>>> Nick
>>>>>>>>>
>>>>>>>>> --
>>>>>>>>> trajce nikolov nick
>>>>>>>>>
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>>>>>>>
>>>>>>> --
>>>>>>> trajce nikolov nick
>>>>>>>
>>>>>>
>>>>>>
>>>>>>
>>>>>> --
>>>>>> trajce nikolov nick
>>>>>>
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>>>> --
>>>> trajce nikolov nick
>>>>
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>> trajce nikolov nick
>>
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--
trajce nikolov nick
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