topic GBuffer in 3ds Max Programming Forum

GBuffer

Anonymous — Wed, 01 Oct 2008 18:08:00 GMT

int width = 1024;
    int height = 768;

    BitmapInfo bi("MyBitmap");
    bi.SetType(BMM_TRUE_32);
    bi.SetWidth(width);
    bi.SetHeight(height);
    Bitmap *bm = TheManager->Create(&bi);

    if (!bm)
    {
        MessageBox (NULL, "Not Creating a bitmap", "Error", NULL);
        return;

       
    }


    GBuffer *gbuf = bm->GetGBuffer(); // Error here

    if (!gbuf) {
        MessageBox (NULL, "Not Creating a GBuffer", "Error", NULL);   
        return;

    }

Is this the correct way to create a GBuffer from the top view ? I am getting a null pointer from the line commented with //Error I did not do any rendering, but assuming this would work, no? Thanks Jack

Re: GBuffer

Anonymous — Wed, 01 Oct 2008 19:11:41 GMT

GetGBuffer() returns a pointer to the GBuffer for the bitmap or NULL if none.
As you've just created the bitmap, it's empty so there's no GBuffer. Try this code on a bitmap containing GBuffer data.

Re: GBuffer

Anonymous — Wed, 01 Oct 2008 20:06:00 GMT

GetGBuffer() returns a pointer to the GBuffer for the bitmap or NULL if none.
As you've just created the bitmap, it's empty so there's no GBuffer. Try this code on a bitmap containing GBuffer data.

Hi
Do I have to render it once to a bitmap (onto the screen) before GBuffer can swing into action?
BTW, when using GBuffer, how do you convert bitmap coordinates back into 3D coordinates?
I actually want to process the rendered bitmap for creating a navgrid....
Thanks
Jack