VPBuffers

Helper

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On 27/08/2007 at 03:17, xxxxxxxx wrote:

Here's how to browse through a multipass bitmap. For lights there is an inner loop that retrieves the data.

The main bitmap should be checked with bmp->IsMultipassBitmap() first and then casted into a (MultipassBitmap* )

  
     LONG j,i,id;  
     LONG cnt = b3d->GetLayerCount();  
  
     for (i=0; i<cnt; i++)  
     {  
          MultipassBitmap *sublayer,*layer = b3d->GetLayerNum(i);  
          if (!layer) continue;  
  
          LONG subcnt = layer->GetLayerCount();  
  
          for (j=0;j<subcnt || subcnt==-1;j++)  
          {  
               if (subcnt>0)  
                    sublayer   = layer->GetLayerNum(j);  
               else   
                    sublayer = layer;  
  
               if (!sublayer) continue;  
  
               id = sublayer->GetParameter(MPB_USERID).GetLong();  
          }  
     }

Helper

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On 27/08/2007 at 10:47, xxxxxxxx wrote:

Thanks Philip,

but what do you mean about main bitmap?

do i need to get it from Multipass::VPBitmap[0]?

Cheers
Renato

Helper

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On 28/08/2007 at 12:26, xxxxxxxx wrote:

You can retrieve the main bitmap by calling

  
MultipassBitmap *mpb = (MultipassBitmap* )renderinstance->GetBuffer(NOTOK,0);

Helper

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On 29/08/2007 at 08:49, xxxxxxxx wrote:

Hello Philip,

where:
LONG subcnt = layer->GetLayerCount();

subcnt always is -1 so the internal cycle go in loop forewer.

What's mean that GetLayerCount() return -1 ?

cheers
Renato

Helper

THE POST BELOW IS MORE THAN 5 YEARS OLD. RELATED SUPPORT INFORMATION MIGHT BE OUTDATED OR DEPRECATED

On 29/08/2007 at 11:08, xxxxxxxx wrote:

But Philip did this in his loop:

for (j=0;j<subcnt || subcnt==-1;j++)

Probably explicitly to avoid the infinite loop. No idea about what -1 represents here though.

Helper

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On 29/08/2007 at 11:35, xxxxxxxx wrote:

Hello dear Robert,

but when the subcnt == -1.. it loop

renato

Helper

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On 29/08/2007 at 12:29, xxxxxxxx wrote:

Are you sure of your types (LONG)? In actuality, all that is needed is:

for (j = 0; j < subcnt; ++j)

Since -1L is less than 0L, the loop should exit immediately. But if ULONG is used, -1L is of course 4 billion.

All else failing, just check for -1 on subcnt and avoid the loop altogether:

LONG subcnt = layer->GetLayerCount();  
if (subcnt < 0)     continue;  
for (j=0; j!=subcnt; ++j)  
...

Helper

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On 30/08/2007 at 01:54, xxxxxxxx wrote:

My excuses... one line of source code was missing!

  
     LONG j,i,id;  
     LONG cnt = b3d->GetLayerCount();  
  
     for (i=0; i<cnt; i++)  
     {  
          MultipassBitmap *sublayer,*layer = b3d->GetLayerNum(i);  
          if (!layer) continue;  
  
          LONG subcnt = layer->GetLayerCount();  
  
          for (j=0;j<subcnt || subcnt==-1;j++)  
          {  
               if (subcnt>0)  
                    sublayer   = layer->GetLayerNum(j);  
               else  
                    sublayer = layer;  
  
               if (!sublayer) continue;  
  
               id = sublayer->GetParameter(MPB_USERID).GetLong();  
               if (subcnt==-1) break;       
          }  
     }

Helper

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On 30/08/2007 at 11:10, xxxxxxxx wrote:

Hello Philip,

ok now but the objectID are the only buffers not detected with this way

any suggestions?

Cheers
Renato

Helper

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On 30/08/2007 at 14:25, xxxxxxxx wrote:

To retrieve the alpha channels use:

  
cnt = b3d->GetAlphaLayerCount();  
for (i=0; i<cnt; i++)  
{  
     B3dBitmap *layer = b3d->GetAlphaLayerNum(i);  
     if (!layer) continue;  
  
     id = sublayer->GetParameter(MPB_USERID).GetLong();  
     if (!id) continue;  
  
     ...  
}

Helper

THE POST BELOW IS MORE THAN 5 YEARS OLD. RELATED SUPPORT INFORMATION MIGHT BE OUTDATED OR DEPRECATED

On 30/08/2007 at 14:26, xxxxxxxx wrote:

Ah.. thanks.. i forgot that ObjectID are in fact alpha channels

Thanks a lot
Renato