To match this, we open again our material editor, select the HDRI-SKYLIGHT Bitmap and scroll down to the Output slot. Now pump up the output ammount from 1 to 1.7 and you can see the result below.
As you can see, the result is much better, but really not perfect. Our white from our vray materials doens´t match the white color from the sphere. And if you take a closer look, you can see that on the top of the sphere there is a part of white, but than it falls into grey. And you can see a little bit green touch on the left of the sphere, and that the shadows fall into more red. So, that we can match our white, we need to change the shadow and brightness values, as well as the color map.
I always start from the values I´ve taken from my reflection sphere. In this case I did the same, and I increased the ammount of brightness. Also I made the shadows more red.
The result is now much better and the white from our 3d sphere comes very close to the white from our sphere on the bg image. Of course you can make a 100% perfect white color match, but for this cg study I think it´s really okay. And it should show you, that it is very important to know, that white can be very different, and that you have to match this color information with your reference probe. If you wouldn´t do that, all your 3d objects and there materials wouldn´t fit to the background image.
Now the first step is done, and now you have to do the same with your grey sphere. So you can get sure, that your 3d created shadows, will also match the shadow from your reference probe. And so we can get sure that the shadows in our 3d environemtn will be correct calculated.
But watch out, that you don´t destroy your white color match, because you only have one HDRI-Skylight which you can match.
So you have finished the basic matching steps. With this setup you will have the possibility to fit every 3d object you want to have into your 3d scene, and the colors and shadows, and reflection will match to your bg image. How does the render work, and which tips should you know to get a good render result, I will tell you on the next sides.
Final Render
Now we want to try our final render. (it´snot the name of the render). For this I´ve built a very easy object, a pyramide with spheres. And on the top I´ve used the name of my great father in law, because it´s in his garden.
As you can see, I´ve used a plane for the ground. And I´ve positioned the plane, that it matches to the real ground of the bg image.
Why we use this plane ? Well, we want that our skylight will produce a shadow on the ground, and that´s the reason for.
Important is to know, that the plane should be a matte shadow. That means, that we want that the plane will receive shadows, and also that it will bounces back some rays. Okay, the theory makes sense, but how does it look like in the praxis ?
When you created your plane, select it, right mouse click and choose the Vray Properties. The following dialog will open:
|
|
|
