Auto Focus

[Stoehr]

I wrote the expression below. I made the focal distance channel a dynamic channel, so it can change over time, but it doesn't seem to have an effect.

http://www.theladyandthelion.com/forumPosts/messiah_problem9.jpg

[fwtep]

Try opening up the aperture. Change the F-Stop to something very low, like 0.5 and see if it has an effect. Also, which depth of field are you using?

Fred

[AlexK]

I have noticed, too, that Messiah's DoF is very gentle. You have to use very low values (0.5-1) to get some reasonable visible effect. I had no time to check against real world lenses yet. Does Messiah simulate real DoF acurately Fred? It just seems so weak at "normal" settings like 5,6 or 8.

[Stoehr]

Try opening up the aperture. Change the F-Stop to something very low, like 0.5 and see if it has an effect. Also, which depth of field are you using?

FredI'm sorry, what I meant by "no effect", is there's no change in the f-curve of the focal distance in the motion graph. Perhaps the change is not visible in the f-curve? And it does effect the focal distance?

I'm using a tight DOF with f-stop of 1.4 on very small distances; ie. 20mm from the camera. I also use a 50mm lense for these tight closeups (15 aperture). I get very nice DOF when setting it manually.

I've been experimenting "sampled" and "interpolated" DOF, but I haven't seen a significant change yet.

I never tried to render the auto-focus, because the f-curve didn't change; like it would in LW when an expression is placed on an f-curve.

All that aside, based on the information I've given, does my expression look accurate?

[CGTalk Moderation]

This thread has been automatically closed as it remained inactive for 12 months. If you wish to continue the discussion, please create a new thread in the appropriate forum.