How To Render Animation With Transparent Background In Blender
This tutorial demonstrates how to render a background paradigm using Blender ii.eight using a Camera Background Image. It also demonstrates how to create and apply a shadow catcher object. Combined these techniques tin be used to superimpose a 3D object onto a flat image background with a shadow that aligns to the background image.
* Please note… I have recently written a newer tutorial that demonstrates how to render a background image in Blender 2.8 using the document world settings. This technique is a lot simpler in that information technology doesn't require whatever work with nodes, and has the added bonus of the background image being able to be reflected in reflective 3D objects. In about ways I recollect this technique is more often than not more intuitive. All the same the technique outlined here, using the photographic camera settings is potentially more suitable if y'all want your background image to function like a layer of film, such as in video compositing.
Firstly, if information technology helps here is a link to the example Blender file and here is a link to the background image that I used in this tutorial.
Part 1 – Render a Background Image Using Blender 2.8.
1. In the Outliner console click on the photographic camera object to select it.
two. In the Properties panel click on the camera backdrop to select it.
3. Select the checkbox for Background Images, then click on the Add Prototype push button.
4. Note that the Background Source should be set to Paradigm past default. Then click on the Open up button.
5. Locate and select your background image.
vi. Click on the button to open the prototype.
vii. In the background images settings gear up the Alpha to one and select the Frame method. (In this case I am using the Crop frame method, nevertheless y'all may adopt i of the other options. Note the frame method that you use every bit this will be required in a later stride).
8. In the viewport click on the photographic camera view push. Note that the background image is at present visible when viewing through the camera.
nine. Select the compositing workspace and the Use Nodes checkbox.
10. Click and drag leftwards in the ruddy surface area of the Render Layers node to create some infinite betwixt the nodes.
xi. In the Add menu select Color – Alpha Over. (You can besides use the keyboard shortcut shift-a to 'add').
12. Click and drag the Alpha Over node over the connecting line between the Render Layers and Composite nodes. Information technology should connect the nodes. So click and elevate on the end indicate of Image to Image connection that is within the Alpha Over node to connect information technology to the bottom Prototype option.
13. Add and Input Prototype node.
14. Connect the Epitome ode to the Alpha Over node and click in the drop down bill of fare at the lesser of the Epitome node and select your background image.
15. Add Distort – calibration node.
xvi. Connect the Scale node the Image Input and Alpha Over nodes as shown. Select Render Size and select the same option as selected in step 7.
17. In the properties console select the rendering properties and nether Film select the checkbox for Transparent.
xviii. Now render an image. Hither I have clicked on the Layout workspace push and so from the Render carte du jour selected Render Image.
nineteen. The render should include the groundwork image.
Part 2 – Create Shadow Catcher Object Using Blender two.8.
1. In the layout view click on the cube object and press x on the keyboard and so select Delete to delete information technology.
2. In the layout press northward on the keyboard to open up the viewport backdrop tools. Make sure that the Photographic camera is selected in the Outliner. So click on the tab for view and select the checkbox to Lock Camera to View.
3. Add Mesh – Airplane.
4. With the plane selected press s on the keyboard to scale the plane. Scroll the angle of the view (On a Mac I scroll on the mouse). Too adjust the location properties (10,Y,Z) to position the plane object.
5. In the properties console render settings, set the render engine to Cycles.
6. With the aeroplane selected in the backdrop click on Object properties and under visibility select the Shadow Catcher checkbox.
7. Select the Rendered viewport shading choice. Here I added a monkey object, positioned information technology, nether Object I gear up it to Shade Shine. I besides added a subdivision surface modifier to smooth it a bit more. Then it is a matter of adjusting the position of the object and the shadow catcher aeroplane. Depending on your background image you may likewise demand adjust the position of the light.
8. Now if you return the image the aeroplane object will be invisible notwithstanding the shadow will remain.
Of form this tutorial only outlines the main relevant steps involved in terms of rendering a background image and using a shadow catcher object to superimpose a 3D object over a flat image background. Naturally a lot of fine tuning can be required to achieve a specific effect that this tutorial does not encompass.
Just in case you are interested my youtube channel includes a lot of similar tutorials. Delight feel welcome to make it affect via contact@henryegloff.com or leave a comment on my youtube channel if anything is unclear or I take missed anything of import.
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Source: https://henryegloff.com/how-to-render-a-background-image-in-blender-2-8/
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