X-Git-Url: https://git.cinelerra-gg.org/git/?p=goodguy%2Fcinelerra.git;a=blobdiff_plain;f=cinelerra-5.1%2Fcinelerra%2Fplayback3d.C;fp=cinelerra-5.1%2Fcinelerra%2Fplayback3d.C;h=f5ef5c4f6b866c88601ba1a8717e19f08627efea;hp=53f6c9e6aa4abc298d6e4c37d9f9125c15fbb4c8;hb=b350aa5a1ccbadcb5f794183c443c0738cd1e9ab;hpb=b8cd5c4f5f296f626f5ec691d2440612bcf59422

diff --git a/cinelerra-5.1/cinelerra/playback3d.C b/cinelerra-5.1/cinelerra/playback3d.C
index 53f6c9e6..f5ef5c4f 100644
--- a/cinelerra-5.1/cinelerra/playback3d.C
+++ b/cinelerra-5.1/cinelerra/playback3d.C
@@ -285,13 +285,15 @@ static const char *feather_frag =
 	"	float fg = rv>=0 ? vv : 1.;\n"
 	"	float bg = rv>=0 ? 1. : vv;\n"
 	"	int len = points.length();\n"
+	"	float sig2 = -log(255.0);\n"
 	"	for( int i=0; i<len; ++i ) {\n"
 	"		float dx = float(points[i].x) - gl_FragCoord.x;\n"
 	"		float dy = float(points[i].y) - gl_FragCoord.y;\n"
 	"		float dd = dx*dx + dy*dy;\n"
 	"		if( dd >= rr ) continue;\n"
-	"		float d = dd*dr;\n"
-	"		float a = (1.-d)*fg + d*bg;\n"
+	"		float ss = dd / rr;\n"
+	"		float d = exp(ss * sig2);\n"
+	"		float a = d*fg + (1.-d)*bg;\n"
 	"		if( rv*(color.a-a) > 0 ) color = vec4(a);\n"
 	"	}\n"
 	"}\n";