For new visitors, please, refer to this thread, which describes a much simpler way to achieve this.

Aernarion.

Nice.

Update

In case anyone wants to do something similar I solved it by making a transparent background and setting an image for the container ViewController.

To make the transparent background y just used:

    glClear(GL_COLOR_BUFFER_BIT);

    glClearColor(0, 0, 0, 0);

Thanks AlessandroB for your help and insights,

:)

----------------------------------------

AlessandroB wrote:

Yes, that's possible. The best way would be to create an OpenGL texture for the background image (the code to do that can be derived from the code used to create the teapot textures in the ImageTargets sample, for instance...)

Then you could render the texture on a screen aligned quad; this should occur right after the call to glClear() which I was mentioning before.

Hi AlessandroB,

I think something like the code I copied from te frameMarker example could work, but unfortunately I'm not familiar with openGL and I don't know how to populate the following variables: numVerts, verts, normals, textCoords and anotherMatrix in order to create a plane that I can apply the texture to. 

glClear(GL_COLOR_BUFFER_BIT);

[self add3DObjectWith:numVerts ofVertices:verts normals:normals texcoords:textCoords with:0 ofIndices:0 usingTextureIndex:0];

Object3D *obj3D = [objects3D objectAtIndex:0];

// Render with OpenGL 2
QCAR::Matrix44F modelViewProjection;
ShaderUtils::multiplyMatrix(&qUtils.projectionMatrix.data[0], &anotherMatrix.data[0], &modelViewProjection.data[0]);    

glUseProgram(shaderProgramID);    

glVertexAttribPointer(vertexHandle, 3, GL_FLOAT, GL_FALSE, 0, obj3D.vertices);
glVertexAttribPointer(normalHandle, 3, GL_FLOAT, GL_FALSE, 0, obj3D.normals);
glVertexAttribPointer(textureCoordHandle, 2, GL_FLOAT, GL_FALSE, 0, obj3D.texCoords);    

glEnableVertexAttribArray(vertexHandle);
glEnableVertexAttribArray(normalHandle);
glEnableVertexAttribArray(textureCoordHandle);    

glActiveTexture(GL_TEXTURE0);
glBindTexture(GL_TEXTURE_2D, [obj3D.texture textureID]);
glUniformMatrix4fv(mvpMatrixHandle, 1, GL_FALSE, (GLfloat*)&modelViewProjection.data[0]);
glUniform1i(texSampler2DHandle, 0);
glDrawArrays(GL_TRIANGLES, 0, obj3D.numVertices);

It would be really helpful if you can provide me with some hints or examples about how can I initialize those variables.

As always, thank you for your time,

Makes a lot of sense, I'll try that later and let you know how it was,

Thanks!

Yes, that's possible. The best way would be to create an OpenGL texture for the background image (the code to do that can be derived from the code used to create the teapot textures in the ImageTargets sample, for instance...)

Then you could render the texture on a screen aligned quad; this should occur right after the call to glClear() which I was mentioning before.

Hey AlessandroB,

Thanks again, actually I'm willing to display an image instead of the black background, is that possible?

You're welcome. 

BT: I forgot to mention; in the code you should be able to find some code like:

glClearColor (0, 0, 0, 0); (or similar...)

in case you want to change the background color (currently rendering Black) with another color (e.g. red, blue...), you just need to change the R,G,B values in glClearColor()

.

Thanks for your quick answer AlessandroB,

It is working like a charm :D

Thanks a lot!

Can you try this simple thing, i.e. adding glClear ( GL_COLOR_BUFFER_BIT  ) after the call to drawVideoBackground() ?

your code in practice should simply become:

...

QCAR::Renderer::getInstance().drawVideoBackground();

glClear (GL_COLOR_BUFFER_BIT);

...

Let me know if that does the trick (it should).

AlessandroB wrote:

Hi, I think you psted the same question here:

https://developer.vuforia.com/forum/unity-3-extension-technical-discussion/avoid-drawing-or-rendering-video-feed-camera

(please avoid double posting in the future, thanks.)

Hi AlessandroB,

Thanks for the insight. I looked for that in iOS but I only have a call to:

QCAR::Renderer::getInstance().drawVideoBackground();

I tryed commenting that line out, but it simply wont render the 3D model when I do that. I would like to know how can I deal with that call to be able to display the 3D model but without displaying the camera feed.

Thanks!

Hi, I think you psted the same question here:

https://developer.vuforia.com/forum/unity-3-extension-technical-discussion/avoid-drawing-or-rendering-video-feed-camera

(please avoid double posting in the future, thanks.)