Best Render Farm for IaaS vs SaaS Architecture: Which Model Fits Architects?
This is the single most important concept in cloud rendering for architects — and the one most people get wrong. There are two fundamentally different types of render farms, and they’re not interchangeable. IaaS (iRender, Xesktop) gives you a full remote desktop with a GPU — you install software, control everything, and render interactively. SaaS (RebusFarm, GarageFarm, Fox Renderfarm) automates batch rendering — you upload a scene file, the farm distributes it, you download finished images. The critical fact: Lumion, Enscape, Twinmotion, and D5 Render work only on IaaS. SaaS cannot run them. V-Ray and Corona work on both. Most architecture studios need one of each.
| Feature | IaaS (iRender, Xesktop) | SaaS (RebusFarm, GarageFarm) |
|---|---|---|
| How it works | Remote desktop — you control a GPU server | Automated — upload scene, download result |
| Real-time apps (Lumion, Enscape, D5, Twinmotion) | ✅ All supported | ❌ Cannot run |
| V-Ray / Corona | ✅ Interactive + batch | ✅ Batch only (faster for multi-image) |
| Software control | Full — install anything | Pre-installed renderers only |
| Pricing | Per hour (~$8.20–14/hr) | Per frame / per render point |
| Billing risk | ⚠️ Timer runs until you disconnect | ✅ Pay only for completed renders |
| Best IaaS | iRender (~$8.20/hr, RTX 4090) ⭐ | — |
| Best SaaS | — | RebusFarm (scene checking) ⭐ |
A Simple Way to Think About It
IaaS is like renting a fully equipped office — you walk in, use whatever tools you need, and leave when you’re done. You pay by the hour, whether you’re actively working or drinking coffee. You can use any software: Lumion, Enscape, V-Ray, Photoshop, everything. But you have to manage the space yourself — including remembering to lock up (disconnect) when you leave.
SaaS is like sending your files to a print shop. You hand over the job, they process it on their machines, you pick up the finished product. You pay per job, not per hour. Extremely efficient for batch work — but you can’t walk in and use their equipment directly. The shop only handles specific file types (V-Ray, Corona, Blender scenes), not interactive applications.
Which Model Should You Start With?
If you use Lumion, Enscape, Twinmotion, or D5 Render: you must start with IaaS (iRender). There is literally no SaaS alternative for these applications. iRender also handles V-Ray interactive work — so it’s the more versatile first choice for most architects.
If you use V-Ray or Corona with 3ds Max exclusively: start with SaaS (RebusFarm or GarageFarm). Batch rendering on SaaS is faster, cheaper, and eliminates the billing timer risk. Add IaaS later only if you need V-Ray GPU Interactive preview for design iteration sessions.
If you use both real-time and offline renderers (the most common scenario for studios): get both. iRender for daytime design work + RebusFarm for overnight batch output. They complement rather than compete with each other.
See more: Start with IaaS for interactive rendering → Start with IaaS for interactive rendering → View IaaS cloud servers on iRender
Frequently Asked Questions
- Why can’t SaaS farms run Lumion or Enscape?
SaaS farms process scenes in automated batch mode — you submit a file, the farm renders it without human interaction. Lumion and Enscape are real-time applications that require a live GPU desktop session. There’s no “scene file” to submit — you must physically open the software, navigate to your camera view, and click render. This interactive process requires IaaS (remote desktop access), which SaaS farms don’t provide.
2. What’s the biggest mistake architects make choosing between IaaS and SaaS?
Using IaaS for V-Ray batch rendering when SaaS would be faster and cheaper. We see studios rendering 10 V-Ray images sequentially on iRender (3–5 hours, $25–41) when the same batch on RebusFarm finishes in 20–45 minutes ($15–35) with parallel distribution. For single images and interactive work, IaaS is correct. For 5+ images of the same scene, SaaS wins hands down.
3. How much should studios budget for IaaS + SaaS combined?
Most mid-size studios (3–5 people, 5–8 projects/month) spend approximately $150–250/month on iRender (IaaS) for interactive work and $50–150/month on RebusFarm/GarageFarm (SaaS) for batch output. Combined: $200–400/month. Firms using only real-time tools (Enscape/Lumion) need IaaS only: $100–250/month. Firms using only V-Ray/Corona batch need SaaS only: $80–200/month.
Related post: Best Render Farm for Multi-GPU Architecture: V-Ray & Redshift Scaling on Cloud
