VrayHDRI Max Size/Resolution?

[tmccarter]

Hey all. I was wondering if there is a maximum image file size / resolution that vray can handle when it comes to HDRI. I have an angular map .hdr file that is 3000 pixels wide and about 12MB in file size. When I try to plug this file into a VrayHDRI material, it doesn't show up in the slot and won't render. So I make a slightly smaller version that is 2048 pixels and about 6MB, and it goes in and renders fine.

The reason we're trying to use the larger file is because it seems like a larger file produces a sharper result. With a 35mm lens, the 2048-pixel-wide hdr looks blurry in our scene.

Any insights?

Thanks,

-Tim

[mike.edel]

cant answer the main question but you can calculate if your hdri is getting magnified at rendertime
thats whats causing the blurry background

depends on your output size and the camera fov

[vlado]

There is no limit in the code, so it all depends on whether the OS can allocate a chunk of continuous memory large enough for the image. At present, VRayHDRI stores the three RGB components as three full floating-point numbers (probably a thing to optimize), which means that every 4-byte pixel from the .hdr image expands to 12 bytes in memory. So a 3000x3000 image would take 9 000 000 x 12=108 000 000 bytes or about 103 MB. This may not sound like a whole lot, but rarely a block of this size is available as one chunk.

If you really must render the large-res image, maybe it's possible to split it into several smaller ones and stitch them with a composite map.

Best regards,
Vlado

[suurland]

I had this problem myself many many times, but I switched to max's hdri loader, it works perfectly.

/Thomas

[artykris]

I have this problem only in W2k (2GBRAM).
In WinXP (1,5GBRAM) everything is fine. HDRIs of 7000pix are loading fine.