SimScene Position

Reference original document date : Feb. 2, 2010. This document is translated the original Japanese document Mr. Honda made.

FMS aircraft position and direction. About the rotation of the photo scenery.

FMS XYZ

The image below shows the direction of each axis of XYZ in FMS. 

AIRCRAFT_POSITION and PILOT_POSITION

When using the initial value of SimScene.exe, the following data will be output. 

AIRCRAFT_POSITION -5 0 -1.7 -0.7 

PILOT_POSITION 0 0 0 FIXED 

The meaning of the four numbers following AIRCRAFT_POSITION are as follows. 

1st: Position in the X direction of the aircraft at the initial screen 

2nd: Position in the Y direction of the aircraft at the initial screen 

3rd: Position in the Z direction of the aircraft at the initial screen 

4th: It seems to be the height at which the aircraft appears at the initial screen. Every scene file is set to a value slightly larger than Z, and it seems to be the reason why the aircraft fell from the ground slightly above the ground on the initial screen. If this value is set to be the same as Z for testing, the aircraft will appear on the surface far below the feet. 

The three numbers after PILOT_POSITION represent XYZ of the pilot position. For photo scenery, X = 0 and Y = 0 normally. If you set a value other than this, the distance to the polygon where the landscape is mapped will change and the landscape will probably collapse. 

The difference between Z of AIRCRAFT_POSITION and Z of PILOT_POSITION is the height of the viewpoint. Usually it is 1.7. It is thought that this is the height from the takeoff plane to the lens of the camera when photographing the photo scene. 

In other words, since the center point (origin) of the photo scene is at the lens position of the camera and the takeoff plane is lower than that, SimScene.exe sets the default value to 0, Z for PILOT_POSITION is 0, Z for AIRCRAFT_POSITION Is set to -1.7. 

The final FIXED disables viewpoint change except zooming. 

Aircraft position and direction

The relationship between the position of the pilot and the X and Y of the aircraft is as shown in the above figure. 

On the initial screen, the nose of the aircraft will always appear with the Y positive direction. This can not be changed. 

Also, the gaze of the pilot is always directed to the position of the aircraft. Therefore, when you look at the aircraft placed in the area where X is negative from the position of the pilot, its nose is facing the right side. The nose of the aircraft where X is placed in the plus region turns to the left. Rightward and leftward looks like that though, the direction of the nose is still facing the Y plus direction of absolute coordinates. 

The lower image shows how to see from the pilot position when X and Y of the aircraft are changed. The number corresponds to the number of the image above. Since there is a runway at positions (1), (2), (3), the positions of (4), (5), and (6) will be off the runway. 

Rotation of scene and direction of launch of nose

The above image shows how to invert the starting direction (seemingly) by inverting the sign of X of the aircraft position and rotating the scene 180 degrees. 

The nose of the aircraft above the image looks to the right. Also, the building is visible behind the left hand. 

By changing the position of the aircraft to (X = -5, Y = 0) ?? (X = 5, Y = 0), the aircraft moves to the position below the image and the nose is on the left It looks facing. In this state, it will be a place off the runway, so rotate the scene 180 degrees. Then, since the nose is facing left, you can see the building behind the left hand, so it seems that the starting direction has been reversed. 

The rotation angle specified by SimScene.exe is this "rotation angle of the scene". 

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Original Japanese document © 2009-2010 katsuhiko honda. all rights reserved. 

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