T_node = (type='CompositorNodeTranslate') Mix_node = (type='CompositorNodeMixRGB')Īf_node = (type='CompositorNodeDilateErode') #_attach_remove_on_cancel(TRANSFORM_OT_translate=) #_node(type="CompositorNodeMixRGB", use_transform=True) Render_h = .resolution_y * render_pīpy._transparent = True #note that it is not necessarily exact so it may be about +-4px (too lazy to do the math correctly) #select the point in pixels from which the background color will be selected I found a way to setup the whole thing with Python and was eager to try it out, so here is the code. Now the background color will adjust automatically. Then you scale the image by large amount (so that the whole image is made up of this one pixel) and you plug that into the first Image input of the Mix node. You basically use the Translate node to move the pixel of the image, that you want to grab the background color from, to the middle of the screen. You can get very close to this behavior without using Python with this node setup: You would need to look at the rendered image, the way is described here, and determine what the background color is, then set the color on the Mix node to that value. You could actually do this in python so that python script sets the color. Now for the last question, how to do this in python (I assume to automate this). Note however that the color of the plane might change if you add a light source or even an object (again due to the way light works). Now each time you render, the background will be this color. Here is a visualisation of what the Feather filter does to the alpha channel: In the compositor you will need to apply a Feather (Dilatate/Erode - mode: Feather) filter to the alpha channel, before plugging it into the Mix node.įeel free to adjust the Distance value (Note that it can be both positive and negative). You will notice the border line, where the plane ends, which is probably undesired and can be fixed by further utilization of the Compositor. You can precisely set the color of the background by checking the color of a rendered image (right click on rendered image to see RGB values), or kind-of automatically (below). Set the desired color of the background on the first Image input of Mix node and finally route the output of Mix node to Image input of Composite node. Go to Compositor (Compositing workspace), tick Use nodes, add a Mix node and route RenderLayers Image output into the bottom Image input of Mix node and Alpha otput of RenderLayers into Fac input of Mix node. Go to Propetries panel > Render > Film and tick the Transparent box. Now the way how to achieve what has mentioned is following. (And the fact that background is not just a color). The reason, why the colors of other objects change, when you change background color is beacause the way light works. Now when you render your scene, your background image will be visible wherever you point the camera.As mentioned by you will need to add the color in compositor. However, in order to see your background image while working on your scene, you MUST be looking through your Camera (press Numpad 0 to switch to it) and also you have to set the 3D Viewport Shading to Rendered: Then click Open and select your HDRI file. Object Properties window > World tab > Surface section > click Use Nodesįor Color, click on the options button ( ), then select Environment Texture Set your World's Surface to an Environment Texture and use an HDR image for the background. Make sure you are using the Cycles Render engine and make sure you are in perspective view, if not press (Numpad-5), Here's how to set one up in your scene in Cycles: You can also see many examples in Google. There are many sources for free HDR images - HDRI Hub is one. These types of images are designed to wrap around your world in a spherical shape so no matter where you look in the scene, you still see the background image: You can use many different kinds of background images, but one of the best types for creating a beautiful 360° background is an HDRI (High Dynamic Range Image). You can easily set a very nice background image for your world by creating an Environment Texture for your World. Setting a World Environment Background Texture in Cycles
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