the version is pbrt-1.03.<br><br><div class="gmail_quote">2009/10/30 John Danks <span dir="ltr">&lt;<a href="mailto:john.danks@gmail.com">john.danks@gmail.com</a>&gt;</span><br><blockquote class="gmail_quote" style="border-left: 1px solid rgb(204, 204, 204); margin: 0pt 0pt 0pt 0.8ex; padding-left: 1ex;">
Which version of pbrt are you using? I was not able to reproduce the<br>
problem with version 2.<br>
<div><div></div><div class="h5"><br>
On Fri, Oct 30, 2009 at 2:14 PM, Mohamed Yessine Yengui<br>
&lt;<a href="mailto:yengui.yessine@gmail.com">yengui.yessine@gmail.com</a>&gt; wrote:<br>
&gt; Hello!<br>
&gt;<br>
&gt; When I tried to render the sphere model with pbrt, I noticed that there was<br>
&gt; a dark point in the resulting image, normally, this point must be<br>
&gt; illuminated. After analyzing, I perceived that the normal vector computed on<br>
&gt; the sphere is not continuous. Could anyone help me to resolve this problem?<br>
&gt;<br>
&gt; This is my .pbrt file and you find in attached the resulting image.  The<br>
&gt; dark point is in the red circle.<br>
&gt;<br>
&gt;<br>
&gt;<br>
&gt;  Film &quot;image&quot; &quot;string filename&quot;  [&quot;sphere.exr&quot;]<br>
&gt;         &quot;integer xresolution&quot; [500] &quot;integer yresolution&quot; [500]<br>
&gt;    Sampler  &quot;bestcandidate&quot;  &quot;integer pixelsamples&quot; [4]<br>
&gt;    LookAt -12 -3 12 0 0 0 0 1 0<br>
&gt;     Camera &quot;orthographic&quot;<br>
&gt;     WorldBegin<br>
&gt;    AttributeBegin<br>
&gt;    CoordSysTransform &quot;camera&quot;<br>
&gt;      LightSource &quot;distant&quot;  &quot;color I&quot; [ 3 3 3 ] &quot;point from&quot; [0 0 0] &quot;point<br>
&gt; to&quot; [-1 -1 1]<br>
&gt;     AttributeEnd<br>
&gt;     AttributeBegin<br>
&gt;      Material &quot;plastic&quot; &quot;color Kd&quot; [1.0 1.0 1.0] &quot;color Ks&quot; [8 8 8] &quot;float<br>
&gt; roughness&quot; [.006]<br>
&gt;     Shape &quot;sphere&quot; &quot;float radius&quot; [.3]<br>
&gt;      AttributeEnd<br>
&gt;     WorldEnd<br>
&gt;<br>
&gt; Thanks<br>
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&gt;<br>
&gt;<br>
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</blockquote></div><br>