Mercurial > octave
changeset 22404:3aab9fb0dd38
light.m: Demonstrate Matlab incompatibilities in demo block (bug #48873).
light.m: Change demo for Matlab compatibility. Add additional demo for
"BackFaceLighting".
| author | Markus Mützel <markus.muetzel@gmx.de> |
|---|---|
| date | Mon, 29 Aug 2016 17:56:28 +0200 |
| parents | cc3be522ec79 |
| children | 81387a85a403 |
| files | scripts/plot/draw/light.m |
| diffstat | 1 files changed, 69 insertions(+), 3 deletions(-) [+] |
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--- a/scripts/plot/draw/light.m Mon Aug 29 12:18:28 2016 -0700 +++ b/scripts/plot/draw/light.m Mon Aug 29 17:56:28 2016 +0200 @@ -377,7 +377,7 @@ %! [x,y,z] = meshgrid (-.5:0.1:2, -2:0.1:2, -2:0.1:2); %! val = x.^2 + y.^2 + z.^2; %! fv = isosurface (x, y, z, val, 1); -%! vn = isonormals (x, y, z, val, fv.vertices, "negate"); +%! vn = isonormals (x, y, z, val, fv.vertices); %! h_axes1 = subplot (1, 3, 1); %! h_patch = patch (fv, "FaceColor", "c", "EdgeColor", "none", ... %! "FaceLighting", "Gouraud", "VertexNormals", vn); @@ -389,7 +389,7 @@ %! %! h_axes2 = subplot (1, 3, 2); %! h_patch = patch (fv, "FaceColor", "c", "EdgeColor", "none", ... -%! "FaceLighting", "Gouraud", "VertexNormals", vn); +%! "FaceLighting", "Gouraud", "VertexNormals", -vn); %! set (h_patch, "BackFaceLighting", "lit"); %! h_light = light (); %! view (h_axes2, [-50 30]); @@ -398,7 +398,7 @@ %! %! h_axes3 = subplot (1, 3, 3); %! h_patch = patch (fv, "FaceColor", "c", "EdgeColor", "none", ... -%! "FaceLighting", "Gouraud", "VertexNormals", vn); +%! "FaceLighting", "Gouraud", "VertexNormals", -vn); %! set (h_patch, "BackFaceLighting", "unlit"); %! h_light = light (); %! view (h_axes3, [-50 30]); @@ -406,6 +406,72 @@ %! axis equal %!demo +%! ## BackFaceLighting 2 +%! ## Matlab fails for "reverselit" with negated isonormals and for "unlit" +%! N = 30; iso = .8; +%! lin = linspace (-1, 1, N); +%! [x, y, z] = meshgrid (1.2*lin, 1.2*lin, lin); +%! val = (x).^2 + (y).^2 - iso/2.7*cos (2*pi*z); +%! val(x>0 & (y-x)>0) = NaN; +%! fv = isosurface (x, y, z, val, iso); +%! vn = isonormals (x, y, z, val, fv.vertices); +%! +%! clf; +%! subplot (2, 3, 1); +%! view (140, 20); +%! axis equal +%! hp = patch (fv, "FaceColor", "r", "EdgeColor", "none", ... +%! "BackFaceLighting", "reverselit", "VertexNormals", -vn); +%! hl = light ("Position", [1 0 .5]); +%! lighting gouraud +%! title ({"BackFaceLighting", '"reverselit"', 'isonormals(...,"negate")'}); +%! +%! subplot (2, 3, 2); +%! view (140, 20); +%! axis equal +%! hp = patch (fv, "FaceColor", "r", "EdgeColor", "none", ... +%! "BackFaceLighting", "lit", "VertexNormals", -vn); +%! hl = light ("Position", [1 0 .5]); +%! lighting gouraud +%! title ({"BackFaceLighting", '"lit"', 'isonormals(...,"negate")'}); +%! +%! subplot (2, 3, 3); +%! view (140, 20); +%! axis equal +%! hp = patch (fv, "FaceColor", "r", "EdgeColor", "none", ... +%! "BackFaceLighting", "unlit", "VertexNormals", -vn); +%! hl = light ("Position", [1 0 .5]); +%! lighting gouraud +%! title ({"BackFaceLighting", '"unlit"', 'isonormals(...,"negate")'}); +%! +%! subplot (2, 3, 4); +%! view (140, 20); +%! axis equal +%! hp = patch (fv, "FaceColor", "r", "EdgeColor", "none", ... +%! "BackFaceLighting", "reverselit", "VertexNormals", vn); +%! hl = light ("Position", [1 0 .5]); +%! lighting gouraud +%! title ({"BackFaceLighting", '"reverselit"', "isonormals(...)"}); +%! +%! subplot (2, 3, 5); +%! view (140, 20); +%! axis equal +%! hp = patch (fv, "FaceColor", "r", "EdgeColor", "none", ... +%! "BackFaceLighting", "lit", "VertexNormals", vn); +%! hl = light ("Position", [1 0 .5]); +%! lighting gouraud +%! title ({"BackFaceLighting", '"lit"', "isonormals(...)"}); +%! +%! subplot (2, 3, 6); +%! view (140, 20); +%! axis equal +%! hp = patch (fv, "FaceColor", "r", "EdgeColor", "none", ... +%! "BackFaceLighting", "unlit", "VertexNormals", vn); +%! hl = light ("Position", [1 0 .5]); +%! lighting gouraud +%! title ({"BackFaceLighting", '"unlit"', "isonormals(...)"}); + +%!demo %! ## Colored patch %! clf; %! [x,y,z] = meshgrid (-.2:0.02:.2, -.2:0.02:.2, -.2:0.02:.2);