Jump to content
aurora

light beam angle

Recommended Posts

Hi,

 

I notice that depending on the light source I was using, I had different RTI results. Therefore I was wondering if the beam angle of the light could have an influence on the result and i there are recomendations on how large/narrow the beam angle should be.  Or if someone knows about publications on that?

 

Thank you in advance for your answers!

Share this post


Link to post
Share on other sites

Hello!

You want even illumination across the surface of your subject - and from an appropriate standoff distance (2 times the diameter of the area you are imaging is the minimum)  We use a wide beam spread for things like a speedlite.  So ours are set to 24mm for the old Canon 580ExII model. Some of the newer models have an even wider spread.  You want to make sure you are pointing the light at the center of the subject, and keep pointing it there for each light angle. In other words, you don't want some light pointing at the center, and others at the edges.  All lights should point to the center.  If you don't have enough light standoff (the distance to the front of the light from the center of the subject) you will not get good quality normals as you move away from the center of your subject.  This is usually visible in the normals visualization, and can often be seen in the specular enhancement mode, especially with no color. 

 

Carla

Share this post


Link to post
Share on other sites

Join the conversation

You can post now and register later. If you have an account, sign in now to post with your account.

Guest
Reply to this topic...

×   Pasted as rich text.   Paste as plain text instead

  Only 75 emoji are allowed.

×   Your link has been automatically embedded.   Display as a link instead

×   Your previous content has been restored.   Clear editor

×   You cannot paste images directly. Upload or insert images from URL.

Loading...

×
×
  • Create New...