Yes, it would be nice to have a possibility to see the result of shadows in preview render immediately without need to comping it, like for example RenderMan, V-Ray etc. In Nuke I have two ways how to comp it, (1) first using the shadow material defined in Houdini and (2) second using constant or anything you want.
For my floor plane alias shadows catcher I used a built-in Material Builder, tweaked the shader little bit to be close to the env asphalt. There is no need to use shadow_matte material. One ROP network, inside 3 render nodes - first for shadow pass (with extra pass direct_shadow), second for the beauty pass of the car and third just an environment background. Just using 2 takes, one for separating the shadows under the car, second for the beaty pass of my car. (Light Portal is behind and above the model angled downwards towards the model)Īnd also tested two more on the sides with a mixed result.So finally I've figured that all out. I need the shadow to be just around the base of the model which is a set of 4 Server Racks.Īfter getting here I tried using a light portal to direct the light but it still casts it far around the model everywhere but where it’s specified. So in the first image of the rendering tests, the alpha shows the shadow but its too big for the project’s desired use. Light Source: aiSkyDomeLight with light samples on 3 ((will increase possibly later to reduce noise in final renders) Intensity is on 1 with a white cloudy sky as the background color and the camera visibility is set to 0 to allow the transparent alpha.Render Settings: Currently on 3, 2, 2, 2, 2, 2 (will increase later for final renders)Shadow capturing surface: Large plane I’m going to be posting the alpha views since its so much easier to view the shadows in general. I got the shadow to capture but now the shadow is too big. I’ve been working on using Arnold’s aiShadowMatte to capture the shadow of a product but still have a transparent background and floor. Tried asking this on other forums without much response/feedback.
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