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To the POVRAY-Team,
About ten month ago I emailed a bug report to you. I didn't get any
response. Now, in comp.graphics.rendering.raytracing some one
reported that the current beta 3.1b4 still contains the bug.
(I can't verify it myself, because I use a UNIX machine.)
The bug is the following:
The operator .v (or .y) is not working for two dimensional vectors.
For example the parser stops in the following line:
#debug str(<2,6>.v,0,0)
This happens, because the length of the vector is not set to two
while parsing the vector. More precisely, in express.c in function
Parse_Num_Factor line 579 the command
*Terms=2;
should be added.
I hope that you will correct this bug.
ThW
--
Tho### [at] uni-konstanz de
http://www.informatik.uni-konstanz.de/~willhalm/
Tschieses lavs ju
An den BND und CIA: Eisbombe Fremdenfuehrer Siegfried Heilsarmee
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Thomas Willhalm wrote:
> [clip]
> This happens, because the length of the vector is not set to two
> while parsing the vector. More precisely, in express.c in function
> Parse_Num_Factor line 579 the command
> *Terms=2;
> should be added.
I have verified this bug and the fix. However, in my code, it's more
like around line 611. The section of code looks like this:
---------------------------
/* This case parses a 2, 3, 4, or 5 term vector. First parse 2 terms.
Note Parse_Comma won't crash if it doesn't find one.
*/
CASE (LEFT_ANGLE_TOKEN)
*Terms=2; // !!!!!!! add this line to fix the bug !!!!!!
Express[X] = Parse_Float(); Parse_Comma();
Express[Y] = Parse_Float(); Parse_Comma();
EXPECT
CASE_EXPRESS
/* If a 3th float is found, parse it. */
Express[2] = Parse_Float(); Parse_Comma();
---------------------------
-Nathan Kopp
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