- Thu Sep 09, 2010 6:43 am
#330230
Hi All, or to anyone familiar with car lighting.
Before i begins, just a bit infomation. Im using Lightwave 3D and with the latest Maxwell plugin installed.
Is about how to use HDRI to lid up a car properly matching a backplate. I did up 2 renders based on 2 different setups (A & B featured below) but both neither gives the right feel.
Note: Both are not final renders so ignore the wrong reflections or windows without highlights etc and no post works yet, but do note on the look and feel shading that were produced on this 2 different setups.
Render A.
This is how the scene was setup.

Image A (actual setup): A HDRI was used in the IBL's reflections, refractions and illumination (All U & V scale 1.0) and each individual of them has their intensity adjusted differently.
Image B & C (tried adjusting HDRI but doesn't work): Environment need to be resized to fit the backplate im going to use so i resized the HDRI used in the IBL. But resizing dont seems to work or i have not done it right? If i reduced the U & V scale down, the result is image B where everything were gone including the road. If i enlarged the U & V scale up, the result is image C where everthing is repeating, images stacking up on top of each other. So both dont works for me. The HDRI cant even be rotated to match the backplate so i have to parent every objects and my camera to a null and rotate the null to an angle i want matching the sun's position.
This was what rendered.

For this setup,
Pros:
1) Shading matches close to the backplate i am using, more natural compare to render B (shown later)
Cons:
1) HDRI cannot be adjusted (size or rotation) freely thus reflection is out.
Render B.
This is how the scene was setup.

Image D (actual setup): Same as setup A but HDRI was used in the IBL's illumination only (U & V scale 1.0) and an emitter sphere was added with the same HDRI used in IBL, mapped onto it. It served as reflections which can be resized and rotated freely and this sphere is unseen by camera so it will not be rendered out.
This was what rendered.

For this setup,
Pros:
1) Emitter sphere can be controlled freely, thus reflections can be in any positions and scale i want.
Cons:
1) Shading is out. It seems like the car is well lid on all side. Kind of unnatural compare to render A (mentioned earlier above)
So my questions are,
1) What have i done wrong and what else can i do to make it better? (beside post works)
2) Why cant the HDRI in IBL be sized properly or rotated?
Regards.
Before i begins, just a bit infomation. Im using Lightwave 3D and with the latest Maxwell plugin installed.
Is about how to use HDRI to lid up a car properly matching a backplate. I did up 2 renders based on 2 different setups (A & B featured below) but both neither gives the right feel.
Note: Both are not final renders so ignore the wrong reflections or windows without highlights etc and no post works yet, but do note on the look and feel shading that were produced on this 2 different setups.
Render A.
This is how the scene was setup.

Image A (actual setup): A HDRI was used in the IBL's reflections, refractions and illumination (All U & V scale 1.0) and each individual of them has their intensity adjusted differently.
Image B & C (tried adjusting HDRI but doesn't work): Environment need to be resized to fit the backplate im going to use so i resized the HDRI used in the IBL. But resizing dont seems to work or i have not done it right? If i reduced the U & V scale down, the result is image B where everything were gone including the road. If i enlarged the U & V scale up, the result is image C where everthing is repeating, images stacking up on top of each other. So both dont works for me. The HDRI cant even be rotated to match the backplate so i have to parent every objects and my camera to a null and rotate the null to an angle i want matching the sun's position.
This was what rendered.

For this setup,
Pros:
1) Shading matches close to the backplate i am using, more natural compare to render B (shown later)
Cons:
1) HDRI cannot be adjusted (size or rotation) freely thus reflection is out.
Render B.
This is how the scene was setup.

Image D (actual setup): Same as setup A but HDRI was used in the IBL's illumination only (U & V scale 1.0) and an emitter sphere was added with the same HDRI used in IBL, mapped onto it. It served as reflections which can be resized and rotated freely and this sphere is unseen by camera so it will not be rendered out.
This was what rendered.

For this setup,
Pros:
1) Emitter sphere can be controlled freely, thus reflections can be in any positions and scale i want.
Cons:
1) Shading is out. It seems like the car is well lid on all side. Kind of unnatural compare to render A (mentioned earlier above)
So my questions are,
1) What have i done wrong and what else can i do to make it better? (beside post works)
2) Why cant the HDRI in IBL be sized properly or rotated?
Regards.