Update README.md

README.md

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 Open access of simulation satellite segmentation and pose estimation dataset: WDICD
 
-The WDICD will be release as soon as possible.
+step1: download the 3d satellite model in NASA and install blender
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+step2: change the model path in the code
+
+step3: create the environment follow pcn
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+step4: Run `blender -b -P render_rgbd_imagefuse.py [ShapeNet directory] [model list] [output directory] [num scans per model]` to render the depth images. The images will be stored in OpenEXR format.
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+step5. Run `python3 process_exr.py [model list] [intrinsics file] [output directory] [num scans per model]` to convert the `.exr` files into 16 bit PNG depth images and point clouds in the model's coordinate frame.