[Bf-blender-cvs] SVN commit: /data/svn/bf-blender [39688] trunk/blender/source/blender/ render/intern/source/convertblender.c: Fix for [#28239] Particles Billboard 3x3 Split Error.

Janne Karhu jhkarh at gmail.com
Thu Aug 25 09:30:12 CEST 2011


Revision: 39688
          http://projects.blender.org/scm/viewvc.php?view=rev&root=bf-blender&revision=39688
Author:   jhk
Date:     2011-08-25 07:30:12 +0000 (Thu, 25 Aug 2011)
Log Message:
-----------
Fix for [#28239] Particles Billboard 3x3 Split Error.
* Patch by Alex Fraser.

Modified Paths:
--------------
    trunk/blender/source/blender/render/intern/source/convertblender.c

Modified: trunk/blender/source/blender/render/intern/source/convertblender.c
===================================================================
--- trunk/blender/source/blender/render/intern/source/convertblender.c	2011-08-25 06:16:26 UTC (rev 39687)
+++ trunk/blender/source/blender/render/intern/source/convertblender.c	2011-08-25 07:30:12 UTC (rev 39688)
@@ -1345,8 +1345,11 @@
 	VlakRen *vlr;
 	MTFace *mtf;
 	float xvec[3], yvec[3], zvec[3], bb_center[3];
+	/* Number of tiles */
 	int totsplit = bb->uv_split * bb->uv_split;
-	float uvx = 0.0f, uvy = 0.0f, uvdx = 1.0f, uvdy = 1.0f, time = 0.0f;
+	int tile, x, y;
+	/* Tile offsets */
+ 	float uvx = 0.0f, uvy = 0.0f, uvdx = 1.0f, uvdy = 1.0f, time = 0.0f;
 
 	vlr= RE_findOrAddVlak(obr, obr->totvlak++);
 	vlr->v1= RE_findOrAddVert(obr, obr->totvert++);
@@ -1420,11 +1423,14 @@
 		else if(bb->split_offset==PART_BB_OFF_RANDOM)
 			time = (float)fmod(time + bb->random, 1.0f);
 
-		uvx = uvdx * floor((float)(bb->uv_split * bb->uv_split) * (float)fmod((double)time, (double)uvdx));
-		uvy = uvdy * floor((1.0f - time) * (float)bb->uv_split);
-
-		if(fmod(time, 1.0f / bb->uv_split) == 0.0f)
-			uvy -= uvdy;
+		/* Find the coordinates in tile space (integer), then convert to UV
+		 * space (float). Note that Y is flipped. */
+		tile = (int)((time + FLT_EPSILON10) * totsplit);
+		x = tile % bb->uv_split;
+		y = tile / bb->uv_split;
+		y = (bb->uv_split - 1) - y;
+		uvx = uvdx * x;
+		uvy = uvdy * y;
 	}
 
 	/* normal UVs */




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