plane for shadow problem

[mpfive]

so i take a plane to reflect the shadow on it.. i assign it to a vraywrap material so it works out fine.. it shows the shadow.. my only problem that when there is a background image, u sort of c the plane in it.. its often different shade.. it could be brighter or darker... here's an example.. an old render of my mazda, u can c the plane as a brighter sqaure in the background.. does anybody know how to fix that problem?? (in the render included, the best seen place is at the trees on the right.. u can c on their trunks how the shades change sharply.. from there u can see the brighter square)

[The IC]

could you make the ground plane have a wall that goes up at the back so that it covers the entire screen? That way you wouldnt see the environment background, youd just see the textured ground plane

[mpfive]

the ground plane is not textured.. it suppose to be invisible.. but still show the shadow.. but i think i can use ur idea.. extend it upwards so that the whole scene background image will be the same shade

[The IC]

yeah, thats what i meant

i use mental ray and the invisible matte/shadow material doesnt work with the skylight properly so i hafta texture the ground plane, thats why i said it that way but it should work either way

[mpfive]

ight.. i'll try that soon.. thnx for ur help