When launching Artlantis, it takes 98% of the processor's calculations and that's why the computer's fan turns on quickly.
The renderer has changed since version 6 requiring new settings for the project and also more power.
The new renderer is a physically correct renderer that does not require sliders to force light colour or shadows as in older versions.
Here is a link to an example video to help you set up your scene: https://www.youtube.com/watch?v=yn-VkAkEfyQ&t=4s
As the renderer has changed and has a marked improvement in rendering quality, it takes a little longer.
Below are some methods to increase the rendering speed:
1- Work with the default values Outdoor / Indoor / Low light
2- Options: Fast / Medium / Quality do not set the option to full, try the Fast option first
3- Set the anti-aliasing to Fixed rate (3 x 3), this means that Artlantis will calculate 9 pixels around a pixel, with the 4x4 rate, it will be 16 pixels so a longer time.
4- It all depends on whether the render is an interior or an exterior (rely on the pre-setting in the render dialog).
5- Never set all the render sliders to the right, you will increase the render times considerably without having a huge difference in quality.
6- In the Preview window, set the Exposure option and not ISO Shutter (click on the toggle button).
7- Activate the ambient occlusion only when necessary (it is to dig the grooves for ex. on a parquet floor, around a door frame...) not necessarily useful if you want to render a facade, more interesting for an interior detail but it lengthens the rendering times.
8- It is necessary to stay on "Speed" or "Normal".
9- Before launching the final render make a test using the Partial Rendering tool available at the top right of the upper toolbar or a quick render with a lower pixel size.
An HDRI background will take longer to render than a simple jpg, png, etc. background image.
I hope these tips will give you satisfaction to keep good rendering speed while enjoying the superior rendering quality.
Concerning the graphics card, Artlantis has the following usage:
* Calculation of certain post-processes in preview
* Calculation of OpenGL renderings for preview and 2D view (wireframe or colour)
* Calculation of overlays
* Storage of the scene geometry
* Storage of preview buffers (rendering, metadata)
THE REST OF THE OPERATIONS ARE DONE ON THE CPU, IN THE HEAVY OPERATIONS WE CAN QUOTE :
* Read/write files
* The calculation of the image in raytrace
* The calculation of the irradiance cache
* The rest of the operations of the application, including the interface
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