Published on February 20, 2014
Adjusting lighting overview The main source of lighting in KeyShot is through environment images. These are 32 bit images designed to map to the inside of a sphere. When the KeyShot camera is inside this sphere, it can be pointed in any direction to see a fully enclosed environment. This method makes the creation of photo realistic lighting as simple as dragging and dropping a thumbnail into the realtime view. KeyShot ships with several different environment types broken into categories. Some are real world photo environments and others are studio environments. The photo environments are usually best suited for automotive or entertainment, wherease the studios are usually best suited for product and engineering. However, both one will produce unique and realistic results regardless of what are being rendered. The above image is a view where the camera has been pulled back to show a 3D model enclosed in an environment. The environment is mapped to the inside of the envrionment sphere Changing environments All lighting is determined by the currently loaded environment. To change an environment, simply drag and drop one from the environment library into the realtime view as shown below. When the left mouse button is released the new environment lighting will be loaded and the lighting of the model will be updated. KeyShot Spain. www.keyshot.es Síguenos también en las redes sociales:
Adjusting lighting overview Adjusting brightness There are multiple methods of adjusting the brightness of the lighting within a scene. Regardless of the method, all changes will be shown instantly in the realtime view. The first method is by using the arrow keys on the keyboard. Up and Down arrows will increase or decrease the environment brightness in large increments. The Left and Right arrows will increase or decrease the brightness in smaller increments. The second method adjusting brightness is by using the brightness slider shown to the right in the environment tab of the project window. KeyShot Spain. www.keyshot.es Síguenos también en las redes sociales:
Adjusting lighting overview Adjusting contrast The contrast of the environment lighting can be adjusted by using the contrast slider shown in the left. This will change the contrast between light and dark areas in the environment lighting. Less contrast will soften shadows and more contrast will sharpen them. Adjusting this value too much can have a negative effect on the realism of the rendered image. It is recommended to leave this at the default value for that reason. Controlling lighting directions and reflections Although the environment lighting that ships with KeyShot is preset, there are quite a few adjustments that can be made to change the look. The first and easiest method is by pressing "control + left click + drag left or right" in the realtime view. This will rotate the environment and change the value of the rotation property found in the environment tab in the project window. The two images below show the same camera view with the same materials and environment. The only difference is the environment rotation. KeyShot can determine the brightest light sources in an environment and will calculate shadows accordingly. The next method of controlling lighting and reflections is by adjusting the height slider found in environment tab in the project window. This will shift the environment sphere up and down and will also change how lighting and reflections affect the model. Another method of controlling the lighting is by adjusting the size of the environment sphere by adjusting the size slider found in environment tab in the project window. Setting the background color Any background color can be set by choosing the color option from the environment tab in the project window. When 'color' is selected, the environment will no longer be shown behind the model. This will have no effect on the lighting of the model and will only serve as a backdrop. However if there are any transparent materials in the scene, the background color will show through them. To change the background color, click on the box directly below the word 'color' as shown below. The box will only be visible when the color option is selected. KeyShot Spain. www.keyshot.es Síguenos también en las redes sociales:
Adjusting lighting overview Ground shadows and reflections Ground shadows and reflections can be enabled under the environment tab in the project window as shown below. Ground plane Ground shadows and ground reflections are projected onto an invisible ground plane. The size of the ground plane can affect the quality of shadows and whether or not shadows and/or reflections become clipped. The ground size can be adjusted by using the ground size slider in the environment tab in the project window. This setting should be set as small as possible without clipping the ground shadows or reflecions. A good way to understand the ground shadow is to compare it to digital images composed of individual pixels. When an image is scaled up and individual pixels can be distinguished, the image loses clarity. When the image is scaled down, the pixels condense together and a clear image is produced. The ground plane works in a similar manner. It is composed of grid squares that are shaded at different intensities to produce the ground shadow. If the ground plane is 128 by 128 squares and a model sits on top of only 8 squares, there is not very much resolution to work with and a shadow can appear blocky. By reducing the ground size, more squares are packed into a smaller area which will improve the ground resolution and the look of the ground shadow. This is why lower ground size values are better. KeyShot Spain. www.keyshot.es Síguenos también en las redes sociales:
Adjusting lighting overview Physical Lights Lights are essentially working as materials that are being applied to parts and objects. Any geometry can be turned into a light source. You can either import new geometry, or use existing geometry to turn into a light source. This gives you greater flexibility in your workflow by allowing you to easily control multiple identical light sources simultaneously, as well as doesn’t require duplicating efforts by being forced to import and place additional objects in the scene. Applying a light: Applying a light material is similiar to applying materials. Light materials will be displayed in the material type drop down. Select the light source type, and KeyShot will update the object to a light. Light sources can be easily found in the scene tree represented by a light bulb. Point Light Diffuse: Will change the geometery into a light source. The power can be controlled by both Watts and Lumens. Point Light IES Profile: When switching the material to IES light you will need to load an IES profile by clicking on the folder icon in the editor. As soon as you load the profile you will see the shape of the IES profile in the material preview. You will also see the shape in form of a mesh in the realtime window. Area Light Diffuse: When applying a type of area light, this will give you a wide range of light dispersion. This will function simliarly to a flood light. Power can be controlled in both Watts and Lumens. Moving lights: Right-click the object/part that is assigned as a light and select "Move Model". This will activate the move tool widget. KeyShot Spain. www.keyshot.es Síguenos también en las redes sociales:
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