Editing an Architectural Scene in Blender with the 3D Cursor and Color Balance

What will you learn in this guide?

In an architectural scene, approximate placement of a new object, light or camera often isn’t enough. When you need to position elements relative to existing geometry or rotate them around a specific point, Blender’s 3D Cursor provides a useful reference. During image processing, the Color Balance node lets you adjust color and tone separately across shadows, midtones and highlights.

In this guide, you’ll first place the 3D Cursor at a precise point in the scene, then use it as a reference for placing and transforming new objects. In the final section, you’ll learn about the Color Balance options and how they affect different tonal ranges. This guide is limited to functions described in the official Blender manual; it doesn’t recommend measurements, lighting values or color recipes for a specific project.

Requirements and getting started

The required software is Blender. The source material comes from the “latest” pages of the Blender Manual, so no specific Blender version number is given here. The sources also don’t specify account, subscription or licensing requirements, so no conditions are stated in that regard.

To follow along, all you need is a Blender scene and the scene elements you want to position or adjust. In the image color adjustment section, we’ll cover the Color Balance node’s inputs and outputs, the role of the Factor value, and the difference between the two color adjustment methods. Interface option names are given in English to match the manual, so we’ve kept them as they appear there.

1. Place the 3D Cursor at the right point in the scene

The 3D Cursor is more than a location marker in three-dimensional space; it also carries orientation information. That makes it useful for different tasks, including adding new objects, setting a transformation pivot, tool orientation and alignment. First, decide what you want to use as a reference in the scene: an existing surface, a grid point, a selected object or coordinates you’ll specify manually.

For quick placement, use Shift + right-click. This method aligns the cursor to the view orientation. For more controlled placement, click a point in the scene with the Cursor tool in the toolbar. The tool’s settings include options to determine orientation relative to the view, the normal of the surface beneath the cursor, or the current transform orientation.

Use perpendicular orthographic views to control depth and horizontal position more precisely. For example, with the top and front views, you can adjust two axes in one view and check depth in the other. The Blender Manual lists Numpad 7 for the top view, Numpad 1 for the front view and Numpad 3 for the right view.

If you need to enter an exact value, edit the location and rotation numerically in the 3D Cursor panel under the View section of the Sidebar. By default, the cursor is projected onto the surface beneath it; if you don’t want this behavior, disable the Cursor Surface Project option in Preferences.

2. Use the cursor as a placement and transformation reference

After placing the cursor, keep in mind that newly created objects appear at its location by default. This is useful, for example, when you want to start new geometry or a light from a specific reference point in an architectural scene. A camera is also among the scene elements you can create. The key to this method is to verify the cursor’s location and orientation before adding an object.

For alignment with existing objects, you can use snapping operations that move the cursor to selected elements, the world origin, the nearest point on the grid or the active object’s origin. The operation’s name and target determine which reference is used. This lets you anchor the cursor to an existing scene element instead of placing it approximately with a click.

To use the cursor as a transformation pivot, set Transform Pivot Point to 3D Cursor. Rotations and scaling will then take place around the cursor’s location. The cursor’s rotation can also serve as a reference for Transform Orientation, allowing transformations to follow a chosen custom orientation. Check your pivot and orientation settings before you start: even if the cursor is in the right place, the expected reference behavior won’t occur unless it’s selected as the transformation pivot.

3. Adjust image tones with Color Balance

The Color Balance node adjusts an image’s colors and values. Its Factor input controls how strongly the node affects the output image. The Type option determines the mathematical method used for color adjustment. The source describes two methods: Lift/Gamma/Gain and Offset/Power/Slope (ASC-CDL).

With Lift/Gamma/Gain, Lift affects the darkest areas, Gamma primarily affects the midtones, and Gain affects the brightest areas. When adjusting an architectural image, first decide which tonal range needs to change; focus on the relevant control instead of changing the whole image at once. These descriptions don’t prescribe which value is aesthetically correct; the result depends on the image and the desired look.

With Offset/Power/Slope (ASC-CDL), Offset controls shadows, Power controls midtones, and Slope controls highlights. The manual describes this model as a standardized method intended to produce the same results from the same values across different applications. The formula is: output = (input × Slope + Offset)^Power. The input here is a pixel value defined in the range 0 to 1; the nominal values are 1 for Slope, 0 for Offset and 1 for Power. These are the nominal values given in the manual, not recommended final settings for every image.

Color Balance can also adjust the white point through input and output color temperatures. On the input side, D65 is the default white point; Tint determines the white point’s shift along the green-magenta axis, and the default value of 10 matches daylight. Temperature and Tint controls are also available on the output side. When using these controls, don’t assume that only the white point changes; the operation affects the image’s color balance. Use Factor to control the strength of the adjustment.

How this affects architectural and visualization workflows

The 3D Cursor is useful to modeling and visualization users who need to work from a specific reference point when adding geometry, lights or cameras to a scene. Snapping to a selected object or the grid, and entering the cursor’s location numerically in the Sidebar, make placement more controlled. Setting the cursor as the pivot can also be useful when arranging a scene that needs rotation or scaling around a particular point.

Color Balance is useful for visualization teams that want to target specific tonal ranges in an image. The sources don’t include information about hardware requirements, licensing terms or compatibility with specific workflows, so no conclusions can be drawn about system performance or commercial use. Check the interface against the Blender version used in your project files, and verify the results of ASC-CDL values shared within your team in the context of the application and image.

Common mistakes

• Not checking the cursor’s location before adding a new object: the object is created where the cursor is.

• Overlooking that Shift + right-click placement uses the cursor’s view orientation: if you need orientation relative to a surface, consider the Cursor tool’s Surface option.

• Expecting a transformation to take place around the cursor without setting Transform Pivot Point to 3D Cursor.

• Assuming that Lift/Gamma/Gain and Offset/Power/Slope use the same control names: their parameter names and described roles differ.

• Focusing only on color settings without controlling the amount of the Color Balance adjustment: Factor determines the strength of the node’s effect.

Next steps

In a small test scene, first position the cursor relative to a surface, then relative to the grid, and add an object to observe the difference. Next, select the cursor as the pivot and try a transformation. For the image, compare Lift/Gamma/Gain and Offset/Power/Slope separately on the same test image; in each test, track one tonal range and the effect of Factor. This lets you compare how each control affects your own scenes and images.

Sources and license

This tutorial is adapted into Turkish from the “3D Cursor” and “Color Balance Node” pages in the official Blender Manual. Both sources are published under the CC BY-SA 4.0 license.