[Bf-committers] Vert colours returning incorrect values.

[Ton Roosendaal]

Hi,

This is very confusing & weird code... and if you want to get help  
finding a bug, we would need the full code. Including how you get to  
print all of this.

This is a call I quickly wrote and checked it works:

void print_tface_colors(Mesh *me)
{
	TFace *tf;
	int a, b;
	char *cp;
	
	tf= me->tface;
	if(tf== NULL) return;
	for(b= me->totface; b>0; b--, tf++) {
		for(a=0; a<4; a++) {
			cp= (char *)(tf->col+a);
			printf("%d %d %d %d\n", cp[0], cp[1], cp[2], cp[3]);
		}
	}
}

-Ton-



On Sunday, Jul 18, 2004, at 05:05 Europe/Amsterdam, Campbell Barton  
wrote:

> Hi, Im writing some code that compares the vert colours of faces with  
> eachother.
>
> The code dosent work beacure the colour values returned from the  
> selected  face colours is incorrect.
>
> eg,  i have 9 white faces on a plane, and when I print the colour  
> values is shows the last 2 faces to be a different colour.
>
> !Match Comparing 255 255 255 with 255 255 255 Comparing 255 255 255  
> with 255 255 255 Comparing 255 255 255 with 255 255 255 Comparing 255  
> 255 255 with 255 255 255
> !Match Comparing 255 255 255 with 255 255 255 Comparing 255 255 255  
> with 255 255 255 Comparing 255 255 255 with 255 255 255 Comparing 255  
> 255 255 with 255 255 255
> !Match Comparing 255 255 255 with 255 255 255 Comparing 255 255 255  
> with 255 255 255 Comparing 255 255 255 with 255 255 255 Comparing 255  
> 255 255 with 255 255 255
> !Match Comparing 255 255 255 with 255 255 255 Comparing 255 255 255  
> with 255 255 255 Comparing 255 255 255 with 255 255 255 Comparing 255  
> 255 255 with 255 255 255
> !Match Comparing 255 255 255 with 255 255 255 Comparing 255 255 255  
> with 255 255 255 Comparing 255 255 255 with 255 255 255 Comparing 255  
> 255 255 with 255 255 255
> !Match Comparing 255 255 255 with 255 255 255 Comparing 255 255 255  
> with 255 255 255 Comparing 255 255 255 with 255 255 255 Comparing 255  
> 255 255 with 255 255 255
> !Match Comparing 255 255 255 with 255 255 255 Comparing 255 255 255  
> with 255 255 255 Comparing 255 255 255 with 255 255 255 Comparing 255  
> 255 255 with 76 66 89
> Comparing 255 255 255 with 255 255 255 Comparing 255 255 255 with 255  
> 255 255 Comparing 255 255 255 with 76 66 89 Comparing 255 255 255 with  
> 63 128 0
> Comparing 255 255 255 with 255 255 255 Comparing 255 255 255 with 76  
> 66 89 Comparing 255 255 255 with 63 128 0 Comparing 255 255 255 with 0  
> 0 0
>
>
> Heres the code that assigns the colours
>
>
> var props
>
> 	
>  /* Here are vars where we store the colours to compare */
>  /* extract of an email from Ton and Douglas Toltzman  What Ton is  
> saying is that there are 4, 8 bit components stored in a 32
>  bit, unsigned value.  I'm not sure of the order of components, but if  
> Ton
>  says "ABGR", then I'd presume the following would be correct
>  - Ton
>  Colors are 'packed' in an int, denoting bytes for ABGR respectively.
>  Put a char pointer to the color, and read the color components    
> individually. Alpha is by default 255. */
>  char *packed_color_array;
>  /* face A- the active save */
>  short redA1, greenA1, blueA1, redA2, greenA2, blueA2, redA3, greenA3,  
>      blueA3, redA4, greenA4, blueA4,
>      redB1, greenB1, blueB1, redB2, greenB2, blueB2, redB3, greenB3,  
> blueB3, redB4, greenB4, blueB4;
> ____________________
>
>
>      /* make sure the face has at lease 3 point before we go on */
>      foundActFace=1;
>      /* face A- the active save */
>      packed_color_array = (char *) &tface[0].col;
>      redA1= packed_color_array[3];
>      greenA1= packed_color_array[2];
>      blueA1= packed_color_array[1];                   
> packed_color_array = (char *) &tface[1].col;
>      redA2= packed_color_array[3];
>      greenA2= packed_color_array[2];
>      blueA2= packed_color_array[1];
>         packed_color_array = (char *) &tface[2].col;
>      redA3 = packed_color_array[3];
>      greenA3 = packed_color_array[2];
>      blueA3 = packed_color_array[1];
>      if (mface->v4) {
>        packed_color_array = (char *) &tface[3].col;
>        redA4 = packed_color_array[3];
>        greenA4 = packed_color_array[2];
>        blueA4 = packed_color_array[1];
>      }
>
> Could anybody tel me why Im not getting all 255,255,255?
> - Thanks
>
>
> --  
> Campbell J Barton
>
> 133 Hope Street
> Geelong West, Victoria 3218 Australia
>
> URL:    http://www.metavr.com
> e-mail: cbarton@metavr.com
> phone: AU (03) 5229 0241
>
> _______________________________________________
> Bf-committers mailing list
> Bf-committers@blender.org
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>
>
------------------------------------------------------------------------ 
--
Ton Roosendaal  Blender Foundation ton@blender.org  
http://www.blender.org