Hi hspradee1
K finally i go to desktop k pls explain wt is the difference between simple seen and complex scene and i go to buy...
Scene complexity is determined by a number of things, these are the main ones:
![[dot]](https://forum.lumion3d.com/Smileys/default/dot.gif "Dot")
Number of polygons, number of materials, number of textures, resolution of textures, number of objects.
Also, the type of Effects used, for example Global Illumination, Reflection Planes, Volume Clouds, are 'high end' effects; they require lots more GPU performance.
And, number of 'high end' effects used per Clip: affects how long it takes to render.
A simple scene might have a small number of polygons and small number of objects for the entourage, but still be much more than a simple scene because it uses expensive effects such as lots of Reflection Planes.
So the difference between a simple and complex scene is the amount and combination of those features.
Note it's a combination of performance features of the PC. That is, (mainly) the GPU, but also motherboard, CPU, RAM.
Morten explains here about how one of the complexity features can impact on using Lumion:
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If you use a lot of high resolution textures on a graphics card with low memory, you are likely to experience stuttering as you move the camera around in the scene in real-time. Especially if you pan from side to side, when new objects come into view. This is because the graphics card needs to load the textures on the fly. Low GPU memory may also result in 'warped 3D points' (streaks/lines of polygons).
A slow graphics card on the other hand will result in a persistently low frame rate, i.e. not a very smooth walk through in real-time.
The smoothness of camera animations is not affected by graphics card memory when rendering MP4s.
In my earlier reply mentioning the topic (
Defining 'complexity'? (Video card recommendation please)) where videos were referenced to get an idea of complexity, you will see that most of those were in the range of 6000 to 8000 Passmarks:
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My assessment, based on the videos is:
There's a range of lower Moderately Complex to Mid (and Upper) Highly Complex 
So the range of Passmarks needed would be 6000 to above 8000.
To be conservative, client should aim for 8000 plus. The price differential in some cases makes little difference to go up, especially considering it's a business investment with a 2 to 3 year life.
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...Graphics - amd redon r9 290 have 6500 pass mark suggest if i go to higher processer or its enough..
In order for you to determine if the desktop with AMD R9 20 graphics card is enough, you need to have an idea about the type of scenes you are going to create with Lumion.
If you can provide some descriptions, or some comparative videos, then we can indicate a little more (no assurances) about the Passmarks required.
Alternatively, I would suggest in answer, that you purchase the best graphics card you can currently get, that is, a GTX Titan X. It has 12GB VRAM with a Passmark of 11244.
An option with less VRAM could be the GTX 980 (4 GB and Passmark 9700).
Also, as we have no idea about your budget we cannot indicate other higher or lessor options.
The desktop you mention fits within the "Recommended System Requirements" from our
LUMION 5: Minimum system requirements. It (should) be able to handle from simple to moderately complex scenes. But because it of the 3GB of VRAM and it's Passmark, it's not going to reach the capability to do complex scenes, or probably do the higher moderately complex type scene.
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DISCLAIMER: Please note that the above does not mean that I or Act-3D endorse specific products. We are unable to offer any guarantees regarding the expected performance in Lumion with the above-mentioned hardware, and you cannot hold us liable for any costs or damages incurred if you purchase hardware based on our posts on this forum or via email.