Irrlicht Engine

RTT:
m_poRenderTarget0 = m_poVideoDriver->addRenderTargetTexture(dimension2d<u32>(m_sResolution.m_lWidth, m_sResolution.m_lHeight), "RTT0", ECF_A8R8G8B8);

Texture:
m_pInputTexture = m_poVideoDriver->addTexture(dimension2d<u32>(m_sResolution.m_lWidth, m_sResolution.m_lHeight), "Surface", ECF ...

Hi,

Isn't there anyone that have an idea about why using a texture loaded from a file as a source in my shader has a different behaviour than a RTT filled with the same texture (draw2DImage) and used as source?
Is there anyone that knowing Irrlicht or the shader technology in the deep see something ...

Hi,
I'm studying how to post-process a region of a video frame, for example to apply a mosaic effect in a small quad region.

In each rendering cycle I have:
1. a texture that represents the current source frame
2. a quad that represents the effect rectangular region
3. a RTT as a destination of the ...

I solved the final issue setting in the addHighLevelShaderMaterialFromFiles(...) call for each shape rendered in the RTT intermediate stage, a EMT_ONETEXTURE_BLEND material type instead of EMT_TRANSPARENT_ALPHA_CHANNEL:

io::path psFileName0; // filename for the pixel shader
psFileName0 = "C ...

Maybe could be that the alpha channel is rendered twice, as it is mentioned in this thread "Draw fonts to RTT with alpha", http://irrlicht.sourceforge.net/forum/v ... hp?t=45901 ?

If yes, is there anyone that know a solution/workaround?

Now, in my simplified test application, also with RTT the alpha is ok (and at this moment I don't know why in my original application it doesn't work), but there is a new problem: using a RTT as intermediate stage, alpha blending has less quality than in the direct rendering case.

No RTT: http ...

a custom shader that simply copies the texture color on output.

Hi,

I wrote a simplified test application with same shaders and png and alpha is ok.
I'm still investigating if the RTT use in my workflow could be the cause.

Hi,

maybe I have found the problem, but I'm not sure.

Going to the Irrlicht source code, the class CD3D9MaterialRenderer_TRANSPARENT_ALPHA_CHANNEL (CD3D9MaterialRenderer.h) enables the alpha-blending and the alpha-test:

pID3DDevice->SetTextureStageState(1, D3DTSS_COLOROP, D3DTOP_DISABLE ...

Hi,

I tried Irrlicht 1.7.3 and now 1.8 release. Windows 7 64bit, Direct3D9 driver.

But I'm an Irrlicht newbie and I believe it's likely my own mistake. Let me add some informations:
- each quad is a couple of triangles, drawn via drawIndexedTriangleList.
- each quad is managed by a custom scene ...

Hi hendu,

I tried to set it to 0 (or to leave the default) but it seems to imply that alpha cutoff value is 0, so the texture appears totally opaque.

Trying value greater than 0, i.e 0.5, the result is that pixels with alpha less than 0.5 are considered fully transparent, and > 0.5 are considered ...

Hello,

In my test application I simply draw two quads, each one with a png texture with alpha channel. To manage the alpha blending I'm trying to use the EMT_TRANSPARENT_ALPHA_CHANNEL flag but it introduces an alpha cutoff (..MaterialTypeParam etc...) that degrades the original textures alpha ...

First of all, I apologize for the sentence "not so stable?" related to IrrCG extension, or other extensions...

About defining a custom scene node, It seems a good way. I'll try it as soon as possible.


Thanks for your informations.

Hi Slavik,

I'm still evaluating both Irrlicht and Ogre libraries.

What I can see is that the Ogre material definition is similar to .fx files, while in Irrlicht seems to not have the possibility to read the passes informations from a standardized file.

Using DirectX I read that I can load a .fx ...

Hi,

Ok, I'm new about programming shaders, but if I have understood correctly, starting from a .fx file:

- I can import the hlsl vertex and pixel shaders, discarding the techniques parts.
- I have to manually implement the techniques performing each passes setting the state values and drawing the ...