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[Octave-bug-tracker] [bug #46538] FaceAlpha in patch is not working
From: |
anonymous |
Subject: |
[Octave-bug-tracker] [bug #46538] FaceAlpha in patch is not working |
Date: |
Thu, 26 Nov 2015 09:13:26 +0000 |
User-agent: |
Mozilla/5.0 (Windows NT 6.3; WOW64; rv:42.0) Gecko/20100101 Firefox/42.0 |
URL:
<http://savannah.gnu.org/bugs/?46538>
Summary: FaceAlpha in patch is not working
Project: GNU Octave
Submitted by: None
Submitted on: Do 26 Nov 2015 09:13:25 UTC
Category: Plotting
Severity: 3 - Normal
Priority: 5 - Normal
Item Group: Incorrect Result
Status: None
Assigned to: None
Originator Name:
Originator Email:
Open/Closed: Open
Discussion Lock: Any
Release: 4.0.0
Operating System: Microsoft Windows
_______________________________________________________
Details:
Hi,
the attribute FaceAlpha is not working correctly.
Any other value than 1 leads to no color at all.
Here is a small example:
T =[
1 2 4
2 3 5
4 5 7
5 6 8
5 4 2
6 5 3
8 7 5
9 8 6];
P = [
0.00000 0.00000 0.00000 0.50000 0.50000 0.50000 1.00000
1.00000 1.00000
0.00000 0.50000 1.00000 0.00000 0.50000 1.00000 0.00000
0.50000 1.00000];
x = P(1,:); y = P(2,:);
z = 1 - (x-0.5).^2 - (y-0.5).^2;
i=1:length(T);
a1 = [ x(T(i,1)) ; y(T(i,1)) ; z(T(i,1)) ];
a2 = [ x(T(i,2)) ; y(T(i,2)) ; z(T(i,2)) ];
a3 = [ x(T(i,3)) ; y(T(i,3)) ; z(T(i,3)) ];
s = ( a1(1:2,i) + a2(1:2,i) + a3(1:2,i) )./3;
r1 = a3(:,i) - a1(:,i);
r2 = a2(:,i) - a1(:,i);
n = cross(r1,r2);
dx = n(1,:)./n(3,:);
%dy = n(2,:)./n(3,:);
patch('Faces',T,'Vertices',P','FaceVertexCData',dx','FaceColor','flat','FaceAlpha',1);
Kind regards
_______________________________________________________
Reply to this item at:
<http://savannah.gnu.org/bugs/?46538>
_______________________________________________
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- [Octave-bug-tracker] [bug #46538] FaceAlpha in patch is not working,
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