Python Bug - RenderDocument results in black Image

Helper

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 RELATED SUPPORT INFORMATION MIGHT BE OUTDATED OR DEPRECATED

On 24/03/2011 at 06:56, xxxxxxxx wrote:

User Information:
Cinema 4D Version: R12
Platform: Mac ;
Language(s) :

---------
Hey guys,

just started learning Python and stumbled on a problem what is apparently a bug. When I render the image with my script and show it in the picture viewer, the resulting image is just black.

Here's the script I use:

import c4d
from c4d import bitmaps, documents
  
doc = documents.GetActiveDocument()
rd = doc.GetActiveRenderData().GetData()
  
res_x = 512	# image resolution x
res_y = 512	# image resolution y
bitdepth = 8 # image depth
  
bmp = bitmaps.BaseBitmap()
bmp.Init(x=res_x, y=res_y, depth=bitdepth)
  
documents.RenderDocument(doc, rd, bmp, c4d.RENDERFLAGS_EXTERNAL)
bitmaps.ShowBitmap(bmp)

Helper

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 RELATED SUPPORT INFORMATION MIGHT BE OUTDATED OR DEPRECATED

On 24/03/2011 at 10:23, xxxxxxxx wrote:

Hi pelZ,

The bit depth in your code is not correct.

Cheers, Sebastian

bitdepth = 24 # image depth

Helper

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 RELATED SUPPORT INFORMATION MIGHT BE OUTDATED OR DEPRECATED

On 24/03/2011 at 11:56, xxxxxxxx wrote:

Originally posted by xxxxxxxx

Hi pelZ,

The bit depth in your code is not correct.

Cheers, Sebastian
bitdepth = 24 # image depth

Hi Sebastian,

that fixes the problem. Thanks!
But why is it 24 (16 and 32 seem to work as well)?

Ciao,
Philipp

Helper

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 RELATED SUPPORT INFORMATION MIGHT BE OUTDATED OR DEPRECATED

On 24/03/2011 at 16:59, xxxxxxxx wrote:

16 bit works fine as well but the image has a lower quality.

Helper

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 RELATED SUPPORT INFORMATION MIGHT BE OUTDATED OR DEPRECATED

On 24/03/2011 at 22:38, xxxxxxxx wrote:

When you render an Image "with 8 Bit" it is 8 Bit per Channel, not the overall bitdepth.

There are 3 Channels. (RGB)
3 * 8 = 24

With Alpha, there are 4 Channels.
4 * 8 = 32

Higher Bitdepths per Channel:
4 * 32 = 128

Cheers, nux