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ahhh. The Delta IV launch pad is really a vessel but its set to not be able to receive focus.

Your CTD is probably due to another add-on. The spot.dss texture was for a spotlight I was working on but couldn't get it to look right.

Thanks! Its been about 3 yrs. Nice to see Orbiter is still going strong!

https://en.wikipedia.org/wiki/Azimuth This was the where I got the basic formula for the autopilot. My code would make adjustments for altitude and recalculate but it just wasn't working as well as it should have. To fix this, when it came close to the desired altitude it would thrust a little...

Its explaned in the Delta IV Launch Vehicles PDF in the add-on docs folder.

It will be in the next version. Its still off slightly, so its going to take some more work.

Ok, Ive changed the code to constantly recalculate the launch azimuth..... Seems to be alot better. Still a slight mis-calculation somewhere but I think recalculating is the way to go.

Switching to the launch azmuth of a base Im passing over 500km away would put the vessel way off course. I wouldnt be at ground level. The current autopilot has less the 0.01 slip angle for most of the first half of ascent. So changing the heading 0.01 during the ascent stage wouldnt make much...

Yes the coodinates are in the equatorial frame. When in the orbit mfd for the ISS click the FRM button on the left.

Payload weight and thrust do have an impact on the launch azmuth. The launch azmuth can be off by as much as 0.1 degrees per 1000kg of payload weight. The auto pilot makes minor adjustments to the launch azmuth depending on the payload weight. If you launch the Delta IV Heavy with an 8000kg...

The code defines a "box" region for individual vessels. The code only defines this for 4 vessels, the DG, shuttleA,PB, and ISS. If its not one of these vessels, it uses a default VECTOR3.

LOL. Im gonna guess its me.:facepalm: So your suggesting recalculate heading every once in a while? Ive tryed so many ways of reaching the desired inclination and what I have now seems to work but, try launching to the ISS. You will get the same inclination but the orbital plane is off. I...

I am looking into the idea of holding the prograde direction after a short while. The problem is the autopilot is based on calculations from http://www.orbiterwiki.org/wiki/Launch_Azimuth. With some calculations to take in account the earths rotation. Not holding the heading until seco...

That rotation would be good. The way it is now, the vessel being hit just inherits direction from the other vessel.

I think to improve on accuracy, more then one "box" could be defined for each vessel.

By the description I added, i didnt think anyone would think its a finished project. I thought maybe another addon developer might be able to work with it and make it something better. I thought about using oapiGetSize for the "collision box" but for some, if not most vehicles ie. ShuttleA...