As you can see, the reflection from our 3d sphere, doesn´t match with the reflection of our bg image. That´s the reason, why we made the probe. Now we want to make some adjustments to match this reflection with the sphere on the bg image.
And now the Output options of our HDR-Bitmap are used to match.
With the three options ammount, rgb offset and rgb level you control the brightness, shadow and color contrast. To get the right reflection, you have to make some changes. If you set the values to the image above, you will get a very nice result. After changing these settings, I´ve made a new render. And now, the 3d sphere looks like the real sphere. You also can edit the values of the color contrast. Click on "Enable Color Map" and try your best. In our example it wasn´t necessary, and we could match it without that edits.
If you would not have the right white balance, and you would have as instance a red touch in your image, than these features are really great to make the changes and try to match as best as you can. Don´t worry if you will not get the best result after seconds, you have to get the right feeling with this feature.
Great, now you have sucessfully matched the reflection.
Matching the HDRI Skylight
Now load your probe with the white sphere as bitmap in your material editor. Change your background image in the viewport, and get sure that you can see your white sphere, instead of the reflective sphere.
Now we want to match the skylight. For this we create a new pure white material. I use a VrayMtl, and choose in the difuse channel pure white with 255/255/255.
Now press render, and see your result.
As you can see, our 3d sphere isn´t really white. That´s because we didn´t get our hdr-image in the vray environment slot. Open your render dialog, Vray: Environment and move from your material editor the HDRI-SKYLIGHT to the GI Environment (Skylight) slot.
Your Vray Environment dialog should now look like this:
Okay, now we put the HDRI-SKYLIGHT into the right slot, now render again and you can see that we will get a grey sphere. That means, that we now have light from the skylight, but as you can see, our white color isn´t really white. Our material settings are okay, because we used a pure white. So what´s wrong with it ? The reason why our white sphere is grey, is that the light which comes from our skylight isn´t bright enough. Now it´s time to match this light information with our probe, so that our 3d sphere looks like the white sphere in the background.
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