- From: <bugzilla@jessica.w3.org>
- Date: Tue, 22 Apr 2014 15:20:54 +0000
- To: public-css-bugzilla@w3.org
https://www.w3.org/Bugs/Public/show_bug.cgi?id=25411
Bug ID: 25411
Summary: Confusion over the specularExponent attribute
Product: CSS
Version: unspecified
Hardware: PC
OS: Windows NT
Status: NEW
Severity: normal
Priority: P2
Component: Filter Effects
Assignee: dino@apple.com
Reporter: paul.lebeau@gmail.com
QA Contact: public-css-bugzilla@w3.org
CC: cmarrin@apple.com, eoconnor@apple.com, smfr@me.com
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.
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Received on Tuesday, 22 April 2014 15:21:00 UTC