16K CALIBRATED HDRI SKIES
When lighting a project in 3D, one of the most popular methods is what we know as IBL (Image Base Lighting), which consists of using a 360º panoramic image with high dynamic range (HDRi) as a lighting source to reproduce forms as closely as possible the actual sky conditions at the time of capture. However, this technique has some important limitations and problems, that is why it is especially important to have quality HDRi to work in 3D since the wrong HDRi can cause problems when lighting our projects, causing worse results than automatic systems of sky and sun that most render engines bring.
This second HDRi Pack contains a selection of 24 HDRi designed to work independently of Pack 01 but at the same time it is perfectly complemented by this, providing new lighting alternatives to professionals.
Also in this new Pack Pro you will find high resolution images taken at the time each HDRi was captured. These images are ideal to be used as backplates in your renders since they fully coincide with the characteristics of the HDRi itself.
WHAT DOES THIS PACK INCLUDE?
This HDRi Pro 02 Pack contains a collection of 24 high resolution (16K) calibrated HDRi. The skies have been photographed in different seasons of the year, with very varied weather conditions and with a wide variety of schedules so that you can find the perfect lighting for your project.
In addition, in this new Pack, all HDRi are complemented by up to 8 high-resolution (8K) photographs in CR2 format obtained at the time and place where the HDRi was obtained in order to be incorporated as Backplates in your renders.
One of the most common problems when capturing HDRi in skies with the sun visible, is the dynamic range, due to the limitations of any camera. The HDRi from 3D Collective have all the necessary dynamic range so that you do not have to modify anything in the file and you can obtain real values of exposure and luminosity in your projects. Simply load one of our HDRi for realistic lighting and true-to-life camera exposure.
In this example, you can compare the result in similar light conditions (sunny day) between a poor quality HDRi and a HDRi from 3D Collective. If you have previously faced the challenge of lighting a project with HDRi, you are probably already familiar with the absence of contrast and the purple or blue colors produced by this type of HDRi, which can be very frustrating and discouraging. With this pack you can achieve images rich in color and contrast in an extremely simple way.
REAL VALUES OF 3D EXPOSURE
Another important challenge when creating this HDRi Skies Pack has been to calibrate the HDRi exposure so that they are a true copy of reality. This allows us to create an exact copy of the real world, in our 3D applications, obtaining a correct exposure of our camera in the project and facilitating the incorporation of artificial lights with real luminosity values.
In our first HDRi Pack we offered a multiplication value that allowed us to guarantee correct exposure to the user. In this new pack we have managed to improve the procedure and ALL skies use a multiplier of 1 so that it is no longer necessary to modify the multiplier in each sky, simply drag your sky to any 3D program to obtain absolute exposure values.
HIGH QUALITY HDRI AND 16K RESOLUTION
In order to capture all the dynamic range present in the sky, .HDR or .EXR files are used, but these high dynamic range files do not have infinite storage capacities, this means that when the dynamic range present in the sky is especially large (when see the sun for example) it is not possible to store the luminosity information in an absolute way so that each pixel of the HDRi represents exactly the luminosity of the sky at that point. In these cases, it is necessary to “Normalize” the exposure of the HDRi in order to store all the information without losing anything. This is a problem in many of the HDRi available in the market because it is difficult to accurately reproduce the actual values of the sky at the time of the capture. In this pack, all the HDRi that have been normalized, are accompanied by a multiplier that will allow you to recover the absolute values of exposure so you can work with real values in camera, simply using that value as a multiplier of your HDRi. Enough with adjusting the inverse gamma and all tests error to try to fix the HDRi. This information is found in the name of the HDRi and in the PDF of the product.
HIGH QUALITY HDRI AND 16K RESOLUTION
When it comes to capturing HDRi images, the most common, is the use of fisheye lenses that allow a very fast capture of the photographs due to their wide angle of vision, however, this type of lens usually has problems of chromatic aberrations and they do not allow to generate images of high resolution. In order to offer high quality 16K HDRi, all the skies of this pack have been captured with high resolution (50+ MP) cameras and high-angle rectilinear super angular lenses to minimize chromatic aberrations allowing an original file of more than 24K which is then reduced to the final 16K HDRi file to reduce noise and guarantee the highest quality standards.
CLEAN HORIZONS 180º COVERAGE
When using HDRi, there are several possibilities: We have HDRi that in addition to the sky contain the original horizon of the place of capture, this can cause trees, buildings, mountains, etc. from the place where the sky was captured are reflected in our projects. This can be useful to do a LookDev quickly, however, when presenting a final project, it is preferable to have independent control over the sky and horizon.
In this new Pack, all our HDRi have been captured and modified to eliminate any intrusive element on the horizon, conserving only elements such as distant mountains of small magnitude that allow us to achieve a more realistic horizon and add important details when we use HDRi as a background. .
We have also extended the HDRi below the horizon line to avoid problems in projects at sea or near the 0 level.
PRECISE COLORS AND COLOR TEMPERATURE
Another challenge in capturing HDRi images is preserving the original colors and color temperature to ensure consistency and to allow for color temperature control similar to that of a photographer in real life. All HDRi from 3D Collective have been made with the help of various systems to check and correct color and exposure such as Color Checker, Luxometer, gray chart, etc. If you want to modify the color temperature of your render, you can do it as a photographer would do on the physical camera or in post-production.
2 HDRi Sunny clear
4 HDRi Sun visible with clouds
6 HDRi Sunset with clouds
4 HDRi Cloudy
2 HDRi Sunrise with clouds
3 HDRi Sunrise Clear
2 HDRi Night with clouds
1 HDRi Clear Night