Okay, this has been bugging me for a while. How do I get the ground color to match the background color when using a color other than white?   I set the background color and ground color to the same blue color. I set the specular and highlight colors and values to be the same. I set the ground to "Shadow_Catch_Only".   I then render the scene, but you can see an obvious "horizon line" where the ground plane ends. (See image) I tried unchecking the "Shadow_Catch_Only", but I get the same result. I tried using the FireFly Renderer and the P4 Renderer and get the same result.   When I set the background and ground to white (255,255,255), the "horizon line" disappears.   Anyone have any good ideas?

Dang it, that should be "Poser 6" not "7'.
Stupid typo. :)
Sorry about that.
 
Though this question could also apply to Poser 5. ;)

well you stop my heart their for a minute (7).

You need to go to the Mat Tab and you will see prop (i think) and you will see ground there. and you put the mat to it...

That was NOT funny, not one bit!! 

Well... kinda!! 

dang - fer a minute there it looked like somebody was spilling the beans :lol:

Could you please post a screenshot of the matroom settings for the ground plane? And also a render to go with each matroom screenshot? Also, any notable things in the scene, such as what kind of lights, how many lights, do any lights have intensity set to a negative value, etc.

e-frontier made some changes to shadow-catching.  Do you have the most recent service release installed?

Yep, I have the lastest Poser SIX patches installed... I'm spelling it out this time to avoid typos. ;-)
 
The material settings for the ground are as close to the background as possible: the diffuse color, specular color, ambient color, etc are all the same. The only difference is that the ground material has a lot more options than the background material (displacement, bump, etc)... though these are all set to 0 (for values) or black (for colors).

yeah, but the incident light on the ground plane is never gonna show up like ya set it in materials, unless ya view ground orthogonally, from above.

Since I've never wanted to get this effect, I don't know if this is a "good idea" or not, but.....
Have you tried setting the transparency on the ground plane to 1 (with 0 falloff, of course)?

Cheers,
Diolma

The big difference here is correctly summed up by Miss Nancy. The background has no angle of incidence on the light, while the ground has. The only time the ground will render the exact same colour as the background will be when you use the ortho camera from the top, and have a white light at right angles to the ground, so that there is no angle of incidence.

The best solution to this is to create a prop with an infinite curve, that acts as your ground plane and the background. This prop, when used with a universal light, will have colours that match closer, as well as getting rid of the horizon line.