How to adjust the visualization of 2D images from Pov-Ray to RaySAR simulation to be consistent?

[hks211]

Dear Professor,
When simulating a virtual tower with RaySAR, in the “Maps in 2D” module, I found that the visualization of the images I simulated is inconsistent with what is displayed in Pov-Ray. I imitated the detailed_building model Pov-Ray code you provided and made some modifications. Here are some steps of my simulation process.

(1) No Ground added and rotate <0,0,0>
Due to Pov-Ray following the left-handed coordinate system, I adjusted the translation and rotation parameters. According to “look at <0,0, -60.458>”, I modified “translate <0,0, 60.458>” and “rotate <0,0,0>”.






(2) No Ground added and rotate <90,0,0>
I adjusted the translation and rotation parameters. According to “look at <0,0, -60.458>”, I modified “translate <0,0, 60.458>” and “rotate <90,0,0>”.




The simulated results above are inconsistent with the orientation displayed in Pov-Ray.
I’m not sure if this is related to the understanding of this.

I don't know how to set the parameters to solve this problem , could you please give me some advice? Looking forward to your reply.

[StefanJAuer]

Could you specify what you mean with “inconsistent”, please? For better orientation, it is useful to add high roughness to all surfaces for the initial modeling/simulation and switch to realistic specular reflection when conducting the final simulation. Von: hks211 ***@***.***> Gesendet: Samstag, 16. März 2024 13:46 An: StefanJAuer/RaySAR ***@***.***> Cc: Subscribed ***@***.***> Betreff: [StefanJAuer/RaySAR] How to adjust the visualization of 2D images from Pov-Ray to RaySAR simulation to be consistent? (Issue #14) Dear Professor, When simulating a virtual tower with RaySAR, in the “Maps in 2D” module, I found that the visualization of the images I simulated is inconsistent with what is displayed in Pov-Ray. I imitated the detailed_building model Pov-Ray code you provided and made some modifications. Here are some steps of my simulation process. (1) No Ground added and rotate <0,0,0> Due to Pov-Ray following the left-handed coordinate system, I adjusted the translation and rotation parameters. According to “look at <0,0, -60.458>”, I modified “translate <0,0, 60.458>” and “rotate <0,0,0>”. image.png (view on web)<https://github.com/StefanJAuer/RaySAR/assets/144893250/f5ad6b4b-fdae-41a3-b34e-90c74276c2ab> image.png (view on web)<https://github.com/StefanJAuer/RaySAR/assets/144893250/479a327c-1d91-44ea-8f3d-3c7f5ccbda46> image.png (view on web)<https://github.com/StefanJAuer/RaySAR/assets/144893250/967d9d4c-1d7f-40c8-bc56-446e4f1b6110> image.png (view on web)<https://github.com/StefanJAuer/RaySAR/assets/144893250/06e47987-281f-41c4-a940-5c53c0fec46f> image.png (view on web)<https://github.com/StefanJAuer/RaySAR/assets/144893250/93aa0dec-60a2-41cd-91af-9c1e30ce2b57> image.png (view on web)<https://github.com/StefanJAuer/RaySAR/assets/144893250/261d56d6-7238-4f56-9223-8be8328833f2> (2) No Ground added and rotate <90,0,0> I adjusted the translation and rotation parameters. According to “look at <0,0, -60.458>”, I modified “translate <0,0, 60.458>” and “rotate <90,0,0>”. image.png (view on web)<https://github.com/StefanJAuer/RaySAR/assets/144893250/4c82ba25-9a9b-4dbc-862b-130c2c5ff944> image.png (view on web)<https://github.com/StefanJAuer/RaySAR/assets/144893250/9ca78160-c1fb-444d-9cdc-45768675fd37> image.png (view on web)<https://github.com/StefanJAuer/RaySAR/assets/144893250/21820144-6e15-4422-afb0-98fd03930095> image.png (view on web)<https://github.com/StefanJAuer/RaySAR/assets/144893250/c76b1098-ba8e-4bf0-a427-1782a521aa4b> The simulated results above are inconsistent with the orientation displayed in Pov-Ray. I’m not sure if this is related to the understanding of this. image.png (view on web)<https://github.com/StefanJAuer/RaySAR/assets/144893250/64139263-2ba6-4cf5-9ce2-9cd4845a93d8> I don't know how to set the parameters to solve this problem , could you please give me some advice? Looking forward to your reply. — Reply to this email directly, view it on GitHub<#14>, or unsubscribe<https://github.com/notifications/unsubscribe-auth/AD4U5T772AJZFR3MOT3PSCDYYQ5IBAVCNFSM6AAAAABEZJL5VGVHI2DSMVQWIX3LMV43ASLTON2WKOZSGE4DSOJVGE4TINI>. You are receiving this because you are subscribed to this thread.Message ID: ***@***.******@***.***>>

[hks211]

Due to Pov-Ray follows a left-handed coordinate system, why are the simulated SAR images generated by Pov-Ray different from the reflection intensity images generated by RaySAR?

Here are some of my understandings, mapping from Pov-Ray to RaySAR is to look down on the y-axis, the x-axis is mapped to Azimuth, and the z-axis is mapped to Slant Range Pixels. So we see a different image in RaySAR than the image we see in Pov-Ray, is that right?

[StefanJAuer]

POV-Ray renders optical images in the width & height plane (optical images), RaySAR uses the generated point cloud of SAR phase centers to generate images in the width & depth plane (reflectivity maps). Hence, there is a difference by definition. Regards Stefan Auer Von: hks211 ***@***.***> Gesendet: Montag, 18. März 2024 13:09 An: StefanJAuer/RaySAR ***@***.***> Cc: Auer, Stefan ***@***.***>; Comment ***@***.***> Betreff: Re: [StefanJAuer/RaySAR] How to adjust the visualization of 2D images from Pov-Ray to RaySAR simulation to be consistent? (Issue #14) Due to Pov-Ray follows a left-handed coordinate system, why are the simulated SAR images generated by Pov-Ray different from the reflection intensity images generated by RaySAR? image.png (view on web)<https://github.com/StefanJAuer/RaySAR/assets/144893250/02378e04-52dc-4c5a-9063-6fbb6863780a> Here are some of my understandings, mapping from Pov-Ray to RaySAR is to look down on the y-axis, the x-axis is mapped to Azimuth, and the z-axis is mapped to Slant Range Pixels. So we see a different image in RaySAR than the image we see in Pov-Ray, is that right? — Reply to this email directly, view it on GitHub<#14 (comment)>, or unsubscribe<https://github.com/notifications/unsubscribe-auth/AD4U5T5PP5CMOFAWC2KMIF3YY3KONAVCNFSM6AAAAABEZJL5VGVHI2DSMVQWIX3LMV43OSLTON2WKQ3PNVWWK3TUHMZDAMBTG42DGMRWGE>. You are receiving this because you commented.Message ID: ***@***.***>

[hks211]

Thank you for your guidance, which made me better understand the principles of simulation, and then I correctly generated the correct results.