Software used: SketchUp, V-Ray for SketchUp, Photoshop, and Picasa
Note: For educational purposes, we will be using the ‘GH House’ model by Ronen Bekerman.
The purpose of this tutorial is to give you some tips and tricks, ideas as well as additional information pertaining to basic photorealistic rendering using V-Ray for SketchUp. In this tutorial, I will walk you through the process of rendering and post-production in order to create an accurate visualization. I did some experiments with the V-Ray for getting a good render output but was never satisfied with the result. Thus, I often use some photo-editing software such as Photoshop and Picasa. My experience and understanding on post-production technique enables me to enhance the raw render output producing such good quality image. For the knowledge of everyone, post-production is a process of editing raw images that enable to enhance the image based on your preferred compositional style output . On the other hand, rendering is the process that generates an image from 3D scene geometry you prepare in SketchUp.
In this tutorial, there will be a three-part discussion highlighting the procedures in rendering as well as post-production techniques. The first part will focus on SketchUp modelling, which is mainly the main core for adding texture and entourage to the scene. The second part will focus mainly on photorealistic rendering of a scene using Vray; this will include material editing and rendering set-up. On the last part of the tutorial, we will discuss the different post-production techniques using Photoshop and Picasa.
STEP 1: Open your SketchUp model. Here is the ‘GH House’ model as a sample. Set the view in perspective mode. Adjust your scene to ‘Shaded with texture’ with shadows turned on.
|STEP 3: Apply the following textures in your SketchUp model.|
STEP 4: Insert 2D entourage in the scene.
STEP 5: Insert 3D entourage in the scene. The following entourage can be downloaded in 3Dwarehouse (the official repository website of all SketchUp users).
STEP 6: Set the ‘Camera’ in ‘Two-point perspective’ mode. This will enable us to avoid distortion when we start the rendering procedure.
STEP 7: After finding your preferred perspective view. Save your scene: view> animation> add scene. Creating a scene in SketchUp enables you to capture a state of model, thus you can go back to the same view and settings when needed.
One of the most important steps in photorealistic rendering is applying the right materials to the model as it gives vibrancy to the whole scene. Some Vismat (V-Ray materials) are downloadable via internet. Here, I will show you the materials setting I used in this model.
STEP 1: Edit the following materials in ‘V-ray material editor’
(1) Pool Water
Pool water reflection settings
Pool water maps settings
Pool water bump map
Glass reflection settings
(3) Wood Deck
Wood deck reflection settings
Wood decks diffuse and map settings
STEP 2: Adjust the V-Ray render settings. This setting is based on the ‘default setting, I just slightly change some parameters.
(1) Environment Settings
Follow the settings for the ‘Background’. Here I used the same HDRI image from the GI skylight. Rotate the angle of the sky to 90 degrees. Adjust the value of intensity to 6.
HDRI Sky preview
(2) Camera settings
Adjust the value of ‘Film speed’ and ‘Zoom factor’. The ‘Film speed’ technically affects the brightness and softness of the render output, thus the greater the value of the film speed the brighter the image will occur.
(3) Output settings
For the final render, adjust the resolution to 2560x2560. But, if you’re doing a test render, it would be better to start with low resolution first before adjusting to higher resolution.
STEP 3: Click the render button
Render time: 1 Hour and 9 minutes
Raw render image result using V-Ray
This is my workflow in post-production and I use both Photoshop and Picasa to enhance my rendered image.
Tree Branch Entourage
Result so far
STEP 2: Open your last image in Picasa and follow the workflow
(1) Set to Orton mode
(2) Sharpen the image
|(3) Apply Glow effect|
|(4) Select ‘I’m feeling lucky’|
(5) Save in JPEG format
Result so far using Picasa
STEP 3: Going back to Photoshop, open the last edited image and follow the workflow.
(1) Adjust the ‘Color balance’
(2) Adjust the ‘Vibrance’
(3) Adjust the ’Hue and saturation’
(4) Adjust the ‘curves’
As optional, you can hit CTRL+M (curve) again if you want to adjust the brightness and contrast of your image or go back to your layer and adjust the settings. I just want to remind you that the post-production settings may vary depending on your raw render image output.
|FINAL RENDER OUTPUT|
Thanks for taking the time to read the tutorial; I hope you will find it helpful to your future projects and presentation.