# More detail on Playground - PCS + Seg Preview (RF-DETR) **URL:** \ **Category:** 🤝 Community Help\ **Created:** [October 31, 2025, 9:31am UTC](https://discuss.roboflow.com/t/more-detail-on-playground-pcs-seg-preview-rf-detr/11407 "2025-10-31T09:31:15Z")\ **Posts on this page:** 7\ **Page:** 1
**Author:** ![anakaine](https://yyz1.discourse-cdn.com/flex029/user_avatar/discuss.roboflow.com/anakaine/32/6549_2.png) [@anakaine](https://discuss.roboflow.com/u/anakaine)\ **Post date:** [October 31, 2025, 9:31am UTC](https://discuss.roboflow.com/t/more-detail-on-playground-pcs-seg-preview-rf-detr/11407/1 "2025-10-31T09:31:16Z")
```auto ``` I would like to know a bit more about what is happening in terms of prompt to segmentation mask when using PCS with Seg Preview (RF-DETR) on Roboflow Playground. I’ve taken an image that I would typically have to run custom training or refinement on if using other models, and for which classes do NOT exist in the COCO class list, given the class as a prompt and it’s got nearly perfect segmentation. I’ve been trying to replicate this in code within my own workbooks using the preview model from the very anaemic examples and code provided, and for the life of me cannot work out what is being used for prompt to mask. The performance in playground is excellent, but I’ll likely need to iterate over hundreds of thousands of images in a a highly customised workflow, so would love to be able to do this locally. > **[Roboflow Playground | Compare & Test Vision AI Models](https://playground.roboflow.com/share/f79a00ee-da35-4271-ac14-4165ebdf7bcd)** > > Roboflow Playground lets you test and compare AI models for computer vision. Run object detection, OCR, captioning, and classification. Vote in Arena and see live leaderboards. ---
**Author:** ![Antonio\_Vidal](https://yyz1.discourse-cdn.com/flex029/user_avatar/discuss.roboflow.com/antonio_vidal/32/8633_2.png) [@Antonio\_Vidal](https://discuss.roboflow.com/u/Antonio_Vidal)\ **Post date:** [November 6, 2025, 7:05pm UTC](https://discuss.roboflow.com/t/more-detail-on-playground-pcs-seg-preview-rf-detr/11407/2 "2025-11-06T19:05:22Z")
Hi, I have the same issue: in the playground you can create new classes dynamically but this is not available in the rfdetr library, would this capability be available in the library in the near future? Thanks ---
**Author:** ![anakaine](https://yyz1.discourse-cdn.com/flex029/user_avatar/discuss.roboflow.com/anakaine/32/6549_2.png) [@anakaine](https://discuss.roboflow.com/u/anakaine)\ **Post date:** [November 12, 2025, 4:04am UTC](https://discuss.roboflow.com/t/more-detail-on-playground-pcs-seg-preview-rf-detr/11407/3 "2025-11-12T04:04:44Z")
It would be nice if this topic got a reply from the Roboflow team. ---
**Author:** ![anakaine](https://yyz1.discourse-cdn.com/flex029/user_avatar/discuss.roboflow.com/anakaine/32/6549_2.png) [@anakaine](https://discuss.roboflow.com/u/anakaine)\ **Post date:** [November 27, 2025, 8:27pm UTC](https://discuss.roboflow.com/t/more-detail-on-playground-pcs-seg-preview-rf-detr/11407/4 "2025-11-27T20:27:23Z")
Still no updates on this one, and it’s probably one of the most useful examples of how to use RF-DETR. ---
**Author:** ![iurisilvio](https://yyz1.discourse-cdn.com/flex029/user_avatar/discuss.roboflow.com/iurisilvio/32/4836_2.png) [@iurisilvio](https://discuss.roboflow.com/u/iurisilvio)\ **Post date:** [November 28, 2025, 9:21am UTC](https://discuss.roboflow.com/t/more-detail-on-playground-pcs-seg-preview-rf-detr/11407/5 "2025-11-28T09:21:07Z")
Hi anakaine, Seg Preview in playground was not RF-DETR, it was [SAM3](https://blog.roboflow.com/sam3/) before release. 😉 Sorry about the naming confusion. You can now use SAM3 in playground and in Roboflow. ---
**Author:** ![anakaine](https://yyz1.discourse-cdn.com/flex029/user_avatar/discuss.roboflow.com/anakaine/32/6549_2.png) [@anakaine](https://discuss.roboflow.com/u/anakaine)\ **Post date:** [November 28, 2025, 9:31am UTC](https://discuss.roboflow.com/t/more-detail-on-playground-pcs-seg-preview-rf-detr/11407/6 "2025-11-28T09:31:52Z")
Hah, well done. Thank you! ---
**Author:** ![system](https://canada1.discourse-cdn.com/flex029/uploads/roboflow1/original/1X/bb6edbfa56d0cf2ee603f061e9e09103502cc8cc.png) [@system](https://discuss.roboflow.com/u/system)\ **Post date:** [December 5, 2025, 9:32am UTC](https://discuss.roboflow.com/t/more-detail-on-playground-pcs-seg-preview-rf-detr/11407/7 "2025-12-05T09:32:39Z")
Closed on December 5, 2025, 9:32am UTC This topic was automatically closed 7 days after the last reply. New replies are no longer allowed.