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<p>[QUOTE=&quot;messydesk, post: 2426551, member: 1765&quot;]Either is sufficient, but moving the light is easier, as it ensures every image can be precisely registered with every other image.&nbsp; What you&#039;re after is knowing for each point on the coin that maps to a unique pixel in a 2D image, what is the color, specularity, and surface normal.&nbsp; The surface normal is what&#039;s key to simulate moving the light around in viewing.&nbsp; </p><p><br /></p><p>Imagine you are taking a picture of a flat mirror, tilted in some unknown direction. You aren&#039;t allowed to look at the mirror in space, only in the photo.&nbsp; You need to determine the direction the mirror is pointing, which is the surface normal of the mirror.&nbsp; You have a light source, the location and direction of which you can know.&nbsp; If you move the light around and take a bunch of pictures, some will show the light reflecting toward the camera, some away.&nbsp; One might show it very bright, since it&#039;s reflecting directly into the camera.&nbsp; This is the picture that indicates the surface normal of the mirror.&nbsp; Since the location of the light source is known we can determine the surface normal by bisecting the angle between the light and the camera (angle of incidence = angle of reflection).&nbsp; For a coin, you do this calculation over the entire image.&nbsp; For a 1000x1000 image, you have 1,000,000 different surface normals.&nbsp; These <i>should</i> allow things like luster to be shown correctly, since each pixel of the image now knows how to behave with different locations of the virtual light.[/QUOTE]</p><p><br /></p>

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