hello just thought i'd add...
The diet and calcium intake of your female chameleons is critical for producing good healthy eggs.
From experiance i have found that poorly calcified eggs often fail to hatch.
If you put a poorly calcified egg next to a healthy egg you will see the difference,good eggs are white(can get stained by the laying substrate tho) with a uniform shell,and have tiny lines on the shell which are the layers of calcium.
Chameleons eggs breath,the top of the shell takes in air and the bottom of the egg takes in the moisture/humidity
Often a poorly calcified egg can give the wrong impression of growth,and tend to draw in too much moisture,the egg blows up and looks very big giving the impression of good growth.but this growth is nothing more than moisture trapped in the egg,in the final month of incubation you will notice that the eggs did not sweat like they should do just before hatch,because the egg shell can no longer breath and pass the moisture through the top of the shell
this then results in the baby chameleon drowning in the egg.
A few tips for avoiding this sad condition
Start to "condition" your egg laying female a good month before breeding,use the best gutloads and keep the supplement routine in check and increase calcium intake slightly,you must keep this up for the 4-6 weeks your female is producing the eggs.
Think ahead,your female will lose lots of calories whilst digging around the egg laying site,make sure she has the correct amount of fat on her body,so she can use it when feeding is reduced,she should be plump and have a good layer of fat on her body(ribs,spine,and tail base should be covered)
Get your humidity level correct from day one,Some People confuse "humidity" with soaking wet and this combined with a poor diet and calcuim intake,is game over for the eggs,
You can always add moisture to your eggs,but removing it is harder,
The mix of vermiculite should be SLIGHTY moist(almost dry) not sopping wet.
i also found that and night time drop during the incubation gave bigger and stronger babies.
Fuss more over your females!

and you should not have any problems
Hope this helps
Luke