[Yars-users] Addon: Pixel shift issue.

[Robert M. <rob...@gm...>]

Hi List,

My modification of Rendertexture.cpp screwed up the grayscale mode. To  
be able to deal with Grayscale, RGB and single channel, I had to add  
this fix to Rendertexture.cpp. (Around line 700):

	if(_colorType == GREYSCALE_TYPE)
	{
		// glCopyTexSubImage2D(_iTextureTarget, 0, 0, 0, 0, 0, _iWidth,  
_iHeight);
		glCopyTexImage2D(_iTextureTarget, 0, GL_LUMINANCE, 0, 0, _iWidth,  
_iHeight, 0);
		
		// // save image in Buffer, for giving back the Pixel-values
		
		pixelBuffer = pBuf;
		glGetTexImage(_iTextureTarget, 0, GL_LUMINANCE, GL_UNSIGNED_BYTE,  
pBuf);
		nrChan = 1;
	}
	else
	{
		// glCopyTexSubImage2D(_iTextureTarget, 0, 0, 0, 0, 0, _iWidth,  
_iHeight);
		glCopyTexImage2D(_iTextureTarget, 0, GL_RGB, 0, 0, _iWidth,  
_iHeight, 0);
		
		// save image in Buffer, for giving back the Pixel-values
		pixelBuffer = pBuf;
		glGetTexImage(_iTextureTarget, 0, GL_RGB, GL_UNSIGNED_BYTE, pBuf);
		nrChan = 3; // RGB, RED, BLUE and GREEN modes all use three channels  
internally
	}
	_texels.resize(_bufferSize);
	int k=0;
	int n=0;
	int padding = 0;
	if (!((_iWidth*nrChan)%4 == 0))
	{
		padding = 4 - (_iWidth*nrChan)%4; // #Bytes used to pad each image  
row.
	}
	//cout << endl << endl << "---------------------- iWidth:" << (int)  
_iWidth << ". nrChan: " << (int)nrChan << ". Padding: " <<  
(int)padding << endl;
	for(int rows=0; rows<_iHeight; rows++)
	{
		for(int cols=0; cols<(_iWidth*nrChan)+padding; cols++)
		{
			if (cols < _iWidth*nrChan)
			{
				_texels[k] = (double)pBuf[n];
				//cout << " TAKEN, written to " << k+1;
				k++;
			}
			//cout << ". Row: " << (int)rows;
			//cout << ". Column Entry: " << (int)cols;
			//cout << ". Value: " << (double)pBuf[n] << endl;
			n++;
		}
	}


IN ADDITION you have to reduce the step legth in directedcamera.cpp,  
line 175:
       for(int i = 0; i< this->_allValues.size(); i++)


Best
Robert


- - - - - - - - - - - - -
Robert Märtin
University of Osnabrück,
Institute of Cognitive Science,
Neurobiopsychology
Room 31/247
Albrechtstr. 28
49069 Osnabrück
Germany

Work: 0541 969 3403
Mobile: 0176 51550153
www.cogsci.uni-osnabrueck.de/~NBP