Change the rendering mode for model views

Tekla Structures
Tekla Structures

Change the rendering mode for model views

Tekla Structures model view rendering can use either DirectX technology or the legacy OpenGL technology.

By default, Tekla Structures uses the DirectX rendering. The DirectX rendering adds a subtle shading effect to Tekla Structures objects, making the 3D visualizations clearer and more defined.

If you want to use the legacy OpenGL rendering, switch the Use legacy rendering option on in File > Settings > Switches.

The rendering setting is model view specific, which means that you can use different rendering options in different model views. If you switch between the rendering options, you need to reopen the model view to activate the rendering option.

DirectX rendering engine

The DirectX rendering mode is better optimized for modern graphics cards, and the graphics performance is better on the recommended NVIDIA GeForce GTX graphics cards than with graphics cards that have a lower end or no graphics processing unit (GPU). For more information on the graphics cards, see Tekla Structures hardware recommendations.

If you want to measure the performance of your DirectX 3D rendering engine, you can use the Tekla Structures graphics hardware test tool from Tekla Warehouse. The tool tests how fast your computer handles graphical information typically used in Tekla Structures, for example, processor speed, load time, average draw time, and per frame details. For more information, see the support article that shows graphs of the collected performance data on different hardware setups.


If you use Tekla Structures via remote connections, the DirectX rendering may not work as expected: parts that you have created may not show in the model, or the model is working slowly. If you experience such problems, switch the DirectX rendering off.

Use the following advanced options to fine-tune the DirectX rendering:

DirectX rendering examples

Visualization of distance

In DirectX rendered model views, the visualization of the distances uses subtle shadows and ambient occlusion. This gives a better understanding of the structure and distances.

DirectX OpenGL

Depth accuracy

In DirectX rendered model views, the accuracy in depth buffer is improved so that when the model is zoomed, parts are not shown through other parts' faces as often as previously.

DirectX OpenGL

Dynamic states

In DirectX rendered model views, in dynamic states, such as in selection and in preselection highlight, the selection is clearer and the highlight is less intrusive.

DirectX OpenGL

Antialiasing for higher fidelity

In DirectX rendered model views, the image quality is by default better than in OpenGL rendered model view, with less flickering.

DirectX OpenGL

High fidelity edge line

In DirectX rendered model views, there are no flickering zigzag lines but continuous, smooth edges.

DirectX OpenGL

Accurate reinforcing bars

In DirectX rendered model views, reinforcing bars have edge lines. When you zoom in, the reinforcing bars are shown as round.

DirectX OpenGL

Automatic edge lines for intersecting material in transparent view

In DirectX rendered model views, you can see where there are intersecting materials in the model.

DirectX OpenGL

Accuracy and clarity on details

DirectX OpenGL

Automatic hatching for overlapping surfaces on same plane

In DirectX rendered model views, duplicate objects or overlapping parts are visualized with a hatch in non-transparent views (Ctrl+4 for parts and Shift+4 for components).

Switch the hatching on in File menu > Settings > Switches > Hatching of overlapping surfaces.

Dashed hidden lines

In DirectX rendered model views, the part edge lines that are hidden behind another part are shown as dashed lines in transparent views (Ctrl+1, 2, 3, or 5 for parts and Shift+1, 2, 3, or 5 for components).

Switch the dashed lines on in File menu > Settings > Switches > Dashed line for hidden line.

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