For example, "Sphere Projection" is usually for HDR images. In some cases you may want to play both the size and projection settings of your HDR / Texture image. You can now access the "Transform" and "Projection" settings according to whether you define the texture or HDR image to "Image texture". USING TRANSFORM OR PROJECTION NODES ON HDR/TEXTURE ENVIRONMENT This is the same as the "Image Texture" setting we described earlier in "Using Textures". Once you have defined the HDR, you can access the "Image texture" settings using the thumbnail arrow next to the texture and change it if necessary. Here you can also define the HDR image you want in the textures slot. hdr extension are automatically assigned to the texture slot. When you select "HDR Environment", an "Image Texture" and "Projection" node with an. Here you can give it a color or you can use another image or procedural texture. When you select "Texture Environment", automatic "RGB Spectrum" texture is assigned to the Texture Slot. When you define texture or HDR environment from LV, default texture is created according to illumination type to the texture slot. Now let's look at the use of Octane HDR / Texture and its options.
We will not go into details here because it is a well-known topic. You can find out more about HDR on wikipedia. We will expalin our examples through HDR images. Also, you can use any image or procedural texture for the "Texture Illumination". You need to use pictures taken with a technique called "high dynamic range" in Hdr illumination.
Another lighting model in Octane is HDR / Texture illumination.