25411 2014-04-22 15:20:54 +0000 Confusion over the specularExponent attribute 2015-02-11 04:45:50 +0000 1 1 1 Unclassified CSS Filter Effects unspecified PC Windows NT RESOLVED FIXED P2 normal --- 1 paul.lebeau dino cmarrin dschulze eoconnor smfr tavmjong public-css-bugzilla oldest_to_newest 104168 0 paul.lebeau 2014-04-22 15:20:54 +0000 I am implementing the lighting filters at the moment and struck a confusing point in the spec. Both <feSpecularLighting> and <feSpotLight> have a specularExponent attribute. But the spec makes no effort to distinguish when each should be used. The confusion applies especially when using feSpecularLighting with an feSpotLight. At the moment I am assuming that the spotlight one is to be used when calculating the spot light colour as per the formula in section 8.10 (feDiffuseLighting). And the one from feSpecularLighting is to be used when calculating the final pixel colour as per the formula in 8.19 (feSpecularLighting). Have I got that correct? Either way, I believe the spec should be clarified. From my testing, it appears some browsers have bugs related to this issue. 114637 1 dschulze 2014-11-07 07:52:00 +0000 (In reply to Paul LeBeau from comment #0) > I am implementing the lighting filters at the moment and struck a confusing > point in the spec. > > Both <feSpecularLighting> and <feSpotLight> have a specularExponent > attribute. But the spec makes no effort to distinguish when each should be > used. > > The confusion applies especially when using feSpecularLighting with an > feSpotLight. > > At the moment I am assuming that the spotlight one is to be used when > calculating the spot light colour as per the formula in section 8.10 > (feDiffuseLighting). And the one from feSpecularLighting is to be used when > calculating the final pixel colour as per the formula in 8.19 > (feSpecularLighting). > > Have I got that correct? Either way, I believe the spec should be clarified. > > From my testing, it appears some browsers have bugs related to this issue. Could you upload your example please? How do SVG viewers differ? Which viewers did you test? 114655 2 tavmjong 2014-11-07 14:26:46 +0000 The 'specularExponent' attribute in 'feSpecularLighting' and in 'feSpotLight' describe two different phenomena: 'feSpecularLighting' Here, the 'specularExponent' represents how light is scattered by a surface. A low value represents a surface that scatters light in all directions while a high value is more mirror like. The value is used as described in 8.19 (feSpecularLighting). 'feSpotLight' Here, the 'specularExponent' represents how focused is the beam of light. A low value represents a spotlight that is diffuse while a high value represents a spotlight that is highly focused. The value is used as described in 8.10 (feDiffuseLighting) A sentence should be added in section 10.4 (feSpotLight) to direct the reader to 8.10 for how the value of 'specularExponent' in feSpotLight is used. An additional sentence might be useful to warn the reader of the two different uses of 'specularExponent'. 114657 3 1536 paul.lebeau 2014-11-07 14:35:48 +0000 Created attachment 1536 Test combinations of specular exponent 114658 4 1537 tavmjong 2014-11-07 14:37:13 +0000 Created attachment 1537 Test SVG for different light sources. This is a test SVG file for different light sources used by <feDiffuseLighting>. In all cases, a white light source is centered directly above the square. Top left: No light source (e.g. no filter). Top center: Distant light (washes out rectangle). Top right: Point light. Bottom left: Spot light, specularExponent = 1. Note that light falls off quicker than for point light source. Bottom center: Spot light, specularExponent = 5. Bottom right: Spot light, specularExponent = 50. Note narrower beam. Firefox (33) seems to render this file correctly. 114659 5 1538 paul.lebeau 2014-11-07 14:37:48 +0000 Created attachment 1538 Specular lighting of a raised ring shape 114660 6 1539 tavmjong 2014-11-07 14:43:35 +0000 Created attachment 1539 Test SVG for different values of specularConstant in feSpecularLighting Test SVG file for different values of specularExponent in feSpecularLighting. A blurred circle (top left) is used to create a bump map to which an feSpecularLighting primitive is applied. Each image (from left to right, top to bottom) has a larger value of specularExponent (1,4,16,64,128). Firefox (33) seems to render the file correctly. 114661 7 paul.lebeau 2014-11-07 14:52:14 +0000 I've added a couple of test files. The one labelled "Test combinations of specular exponent" has four squares lit by the four different combinations of the two vales of specularExponent. My recollection was that there were significant different between the three browsers Chrome, FF and IE when I originally reported this bug. Now the renderings still vary but are quite close. Perhaps bugs have been fixed. With the second file "Specular lighting of a raised ring shape ", Chrome is significantly different from the other two. FF and IE11 are similar, but not exactly the same. My experience is that almost any test file involving the lighting primitives will show up significant differences between the browsers. Perhaps the descriptions of these primitives need expansion or clarification to remove these differences. Or perhaps there needs to be more tests for these. IIRC there are only about half a dozen lighting tests in the test suite. 117846 8 dschulze 2015-02-11 04:36:40 +0000 (In reply to Paul LeBeau from comment #7) > I've added a couple of test files. > > The one labelled "Test combinations of specular exponent" has four squares > lit by the four different combinations of the two vales of specularExponent. > > My recollection was that there were significant different between the three > browsers Chrome, FF and IE when I originally reported this bug. Now the > renderings still vary but are quite close. Perhaps bugs have been fixed. > > With the second file "Specular lighting of a raised ring shape ", Chrome is > significantly different from the other two. FF and IE11 are similar, but > not exactly the same. > > My experience is that almost any test file involving the lighting primitives > will show up significant differences between the browsers. Perhaps the > descriptions of these primitives need expansion or clarification to remove > these differences. Or perhaps there needs to be more tests for these. IIRC > there are only about half a dozen lighting tests in the test suite. This was discussed and we added notes to make sure that authors see where the differences are. 1536 2014-11-07 14:35:48 +0000 2014-11-07 14:35:48 +0000 Test combinations of specular exponent test_filter_spotlight_exponent.svg image/svg+xml 3543 paul.lebeau PD94bWwgdmVyc2lvbj0iMS4wIj8+DQo8IURPQ1RZUEUgc3ZnIFBVQkxJQyAiLS8vVzNDLy9EVEQg U1ZHIDEuMS8vRU4iICJodHRwOi8vd3d3LnczLm9yZy9HcmFwaGljcy9TVkcvMS4xL0RURC9zdmcx MS5kdGQiPg0KPHN2ZyB3aWR0aD0iNzIwcHgiIGhlaWdodD0iMTgwcHgiIHZpZXdCb3g9IjAgMCA0 MDAgMTAwIiB4bWxucz0iaHR0cDovL3d3dy53My5vcmcvMjAwMC9zdmciIHZlcnNpb249IjEuMSI+ DQoNCiAgPGRlZnM+DQoNCiAgICA8ZmlsdGVyIGlkPSJNeUZpbHRlcjEiIGZpbHRlclVuaXRzPSJ1 c2VyU3BhY2VPblVzZSIgcHJpbWl0aXZlVW5pdHM9InVzZXJTcGFjZU9uVXNlIiB4PSIwIiB5PSIw IiB3aWR0aD0iMTAwIiBoZWlnaHQ9IjEwMCI+DQogICAgICA8ZmVHYXVzc2lhbkJsdXIgaW49IlNv dXJjZUFscGhhIiBzdGREZXZpYXRpb249IjIiIHJlc3VsdD0iYmx1ciIvPg0KICAgICAgPGZlU3Bl Y3VsYXJMaWdodGluZyBpbj0iYmx1ciIgc3VyZmFjZVNjYWxlPSI1IiBzcGVjdWxhckNvbnN0YW50 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