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If it's HDRI, then it means data about environment lighting situation is already there, so if you want your lighting look as it was intended by the creator of the Map, then do not mix it up with anything else. Corona can sample HDRI maps well, so if there is a strong sun spot on your HDRI map, you will get those nice crisp shadows.
When opening HDR files, always make sure you set them to 32bit and def. exposure when opening.
It looks like the sky is uniform so there are no visible shadows or shading. Maybe it's because of the HDRI you're using. Can you show it? If you want to keep it, try changing contrast between the HDR skylight and sun, for example use lower intensity of HDR and stronger sun.
It looks like your hdri is lighting your scene almost equally from all sides, I guess you could achieve the same lighting using a single color as environment lighting..
As rawa said try to avoid sun, instead use photoshop or if you have vray then vrayhdri and play with gamma and exposure settings for hdri itself to get more contrast. This will give you hard shadows and some variations in lighting...
If it fails, try different hdri or you might also try corona sky + sun...
@Lacilaci & Keymaster: this is my raw render using HDR and corona sun. As you can see, its kinda dull.
Maybe you can give some suggestion here. I'm kinda stuck here T.T
You just have to tweak the input image itself, it is virtually impossible to get anything else than the single correct unbiased result from Corona in this situation
Why would you use corona sun when it's an HDRI?
could you please tell me how to do that? :)
That's pretty easy to do.
First you need to have gamma workflow setup correctly ("Rendering" -> "Gamma/Lut Setup".
I keep it this way:
input and output to 2.2 (whereas output is more a personal decision, I have it setup to 2.2 for scripting reasons, normally - in an exr workflow - I'd tend to use 1.0)
After that the important step is documented here... If you load a bitmap texture you have to check "override" and set it to 1.0, this means the map will be loaded with gamma 1.0 (which will obviously look too bright in your editor but that's ok)
