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I try to apply a baked normal map. I use 'blender render', load the obj mesh, create a material (default option), then load a normal map as texture (linked to this material) and in the 'influence tab' I uncheck 'color' and check 'normal', while in the 'image sampling' tab I check 'normal map' and choose tangent in the drop-down menu.

I render with a camera and a few lights and initially the result looks great when the camera is on one side. However when I position the camera to look at the other side, rendering is completely dark. The normals however look perfectly fine. Very few seem to be pointing inwards, but this is not the case as at the webbing between the fingers some normals penetrate the opposite triangle during visualization. However just for the sake of it I recalculated the normals and the problem still remains.

Any idea why this may be happening?

I attach below a few screenshots to better showcase what I describe above.

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  • $\begingroup$ Some of your Normals are pointing inward. Select all and "Recalculate Normals". $\endgroup$
    – Dontwalk
    Jun 18, 2018 at 16:19
  • $\begingroup$ My bad, I forgot to mention that I already did it. I edited the original post: "Very few seem to be pointing inwards, but this is not the case as at the webbing between the fingers some normals penetrate the opposite triangle during visualization. However just for the sake of it I recalculated the normals and the problem still remains. " $\endgroup$
    – dim_tz
    Jun 18, 2018 at 16:31
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    $\begingroup$ It appears that you have sun lamps and they are pointing downwards. So even though physically one or two are below the object they are only emitting light "down" so the bottom of your object is in shadow. $\endgroup$
    – Dontwalk
    Jun 18, 2018 at 16:37
  • $\begingroup$ Ah, that was it. I thought that the sun is not very different than an omnidirectional point light. If you want to post a 'reply' to this question I will accept right away. $\endgroup$
    – dim_tz
    Jun 18, 2018 at 16:49

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It appears that you have sun lamps and they are pointing downwards. So even though physically one or two are below the object they are only emitting light "down" so the bottom of your object is in shadow.

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