Hey guys, I didn't know which forum to ask this in specifically...so I picked one close.
I've been working on a Dodge Charger off and on for some time now, and started rendering it in the HDRI from AMoody on here...
Thing is, the reflections are off when I try to align the backplate to HDRI. As you can see, the car isn't even fully on the road according to the HDRI, and it won't adjust in.
Short of buying a program like PTGUI Pro and adjusting the center of the HDRI, how should this be taken care of?
I also have this problem with the Suurland free sample... And to lesser extent some other HDRI.
If there's another thread on here somewhere, I apologize. I couldn't find one specifically.
Thanks,
Gavin
P.S. Feel free to ignore the horrid lighting and materials in the render -- it's a test.
Not sure what you mean by render the HDRI as background...
I have the backplate in Max's environment slot, with a screen environment setting on the bitmap. The HDRI is in a VRay HDRI (spherical) texture loaded into a VRay Dome light 2 meters off the ground, with the light set to full spherical emit. The car is sitting at the very center of the scene (the light is positioned directly above the car)
I've tried setting the camera at the center of the scene and rendering like that, but the reflections are even worse.
Its possible that your HDRI is inverted, that's probably why you have difficult time to adjust it to match reflection via background. I assume, you are using Bitmap loader for your HDRI?? if that so, you'll need to put -1 in U Tile inside Bitmap loaded. to get this inverted.
ok just add the hdri map or vrayhdrimtl into the environment backround and then you will see the hdri as backround instead of the backplate.. so you can see how the colors, brightness and contrast and position matches.. thats the way im doing it.. im also using vrayhdrimtl instead of loading as bitmap.. so you have better controll witht the gamma and the rotation of the hdri.. what i also do is i slightly change the gamme on the hdri and the rest i do with gamma on vray color mapping.. uncheck affect backround and so you can easily optimize the hdri... if its still not possible to get both correct than use photoshop for other corrections..
That's how I do align my HDRI and backplate, sticking them in the environment slot and aligning from there...and the way (other than reflections) I know I am off. They simply do not align...
When I'm on my desktop I'll try to take screenshots showing the backplate vs. HDRI in the environment slot.
I've tried it using the VRayHDRI texture and bitmap texture. Same problem either way.
for as good as i know PTGui, you cannot edit HDR images with it... just stitch them.
when i open a equirect image (360) in PTGui, it still asks me for focal length and crop factor... with the shortest focal point you just get a hemisphere out of your full-spherical HDR map. HDRshop might work better for editing HDR panoramas.
but i doubt if the problem lies here, since averybody else doesn't have to do this, too bad i don't know Vray, would love to help you out...
That's how I do align my HDRI and backplate, sticking them in the environment slot and aligning from there...and the way (other than reflections) I know I am off. They simply do not align...
When I'm on my desktop I'll try to take screenshots showing the backplate vs. HDRI in the environment slot.
I've tried it using the VRayHDRI texture and bitmap texture. Same problem either way.
If I understand you correctly, you wanted to create background out of HDRI? If so... you could map it to sphere, and set camera inside the sphere and center it rotate however you want it to be and render. Unfortunately, you won't get best quality image.
Here's the problem in the screenshot...
The reason nobody else has this problem is why I am so perplexed. xD I've looked up tutorials and such on the web and everyone seems to be doing it in the same way except only I have bad reflections.
One option is to make the carpaint so unreflective that it doesn't show clearly what is and isn't the road, but I'd rather avoid that.
@ EquiNOX -- no, I just want to set the HDRI in the scene so I get proper reflections. Which doesn't seem to be my forte, at this point.
You know, you can't really compare HDRI and Backdrop, since they took by different type of lens. Not only that, moody took Photo on the roadside, standing at different perspective view which might get little off. He's probably a little scared of passing cars which lost a little focus on perfect spot.
Yet, MOST of Good or Best HDRI outhere is about 90 percent perfect to Backdrop, and you shouldn't be too much of concerned because the purpose of using HDRI is trying to match environment color, light, and etc to backdrop image. And you shouldn't have car paint to look too reflective.
and you shouldn't be too much of concerned because the purpose of using HDRI is trying to match environment color, light, and etc to backdrop image. And you shouldn't have car paint to look too reflective.
I learn something new every day, even if I thought I knew it.
Thanks, EquiNOX.
1. Check your FOV is the same as the camera used for the bp.
2. The car is a wee bit too small, look at the size of the road markings on the side of the road.
3. Are you using a floor plane?
If you want post your scene (without car) and Im sure one of us can have a look.
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If you used the Mental Ray production shaders (and the matte mask), with the environment switchers the POV differences from backplate and 360 are not so relevant. As the matte mask will use your back plate for reflections under the car, with the 360 for off screen reflections. Using the advanced raytype switcher you can have even more control over what is affected (eye, refraction, rays etc.).
Add mr photographic exposure and that gives even more flexibilty.
I haven't finished my car-specific tutorial on using Production Shaders but this will give you the idea : http://www.dmmultimedia.com/3dtips_11.htm
Dave
Originally Posted by gvnwst
Here's the problem in the screenshot...
The reason nobody else has this problem is why I am so perplexed. xD I've looked up tutorials and such on the web and everyone seems to be doing it in the same way except only I have bad reflections.
One option is to make the carpaint so unreflective that it doesn't show clearly what is and isn't the road, but I'd rather avoid that.
@ EquiNOX -- no, I just want to set the HDRI in the scene so I get proper reflections. Which doesn't seem to be my forte, at this point.
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Originally Posted by gvnwst 
