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Old 09-10-2019, 04:56 PM   #1
gattispilot
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Default Upright landers in 2016

I think there needs to be some work done for light weight landers in 2016. Not sure if it touchdown, operator related?

Any thought process on how to do this?
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Old 09-11-2019, 08:15 AM   #2
4throck
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This works for 2001 Aries Ib (a heavy lander) in Vessel Builder.
There's minor skidding but you reach a landed state after a few second by applying brakes.

The relevant parameters are:

Code:
;<-------------------------GENERAL SETTINGS - Configuration: 0------------------------->
 
EMPTY_MASS = 23465
VSIZE = 10
PMI = 20 20 10
CSECTIONS = 20 20 20
GRAVITYGDAMP = 0
ROTDRAG = 0.01 0.01 0.01

.....

;<-------------------------PROPELLANT DEFINITIONS------------------------->
 
PRP_0_ID = 0
PRP_0_MAXMASS = 84880
PRP_0_EFFICIENCY = 1206
PRP_0_PRIMARY = TRUE
PRP_0_NAME = Tank_0
 
....

;<-------------------------TOUCHDOWNPOINTS DEFINITIONS------------------------->
 
TDP_1_0_POS = 8.66025 -5 -10
TDP_1_0_STIFFNESS = 708576
TDP_1_0_DAMPING = 498735
TDP_1_0_MU = 3
TDP_1_0_MULNG = 0.2
 
TDP_1_1_POS = -8.66025 -5 -10
TDP_1_1_STIFFNESS = 708576
TDP_1_1_DAMPING = 498735
TDP_1_1_MU = 3
TDP_1_1_MULNG = 0.2
 
TDP_1_2_POS = 0 10 -10
TDP_1_2_STIFFNESS = 708576
TDP_1_2_DAMPING = 498735
TDP_1_2_MU = 3
TDP_1_2_MULNG = 0.2
 
TDP_1_3_POS = 0 0 10
TDP_1_3_STIFFNESS = 708576
TDP_1_3_DAMPING = 498735
TDP_1_3_MU = 3
TDP_1_3_MULNG = 0.2

Last edited by 4throck; 09-11-2019 at 08:17 AM.
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Old 09-11-2019, 10:37 AM   #3
gattispilot
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Brakes on a lander?

So I try the viram lander. It was upright but then slowly moved and then ended up in space

Code:
ClassName = VesselBuilder1
Module = VesselBuilder1
 
;CONFIGURATION FILE FOR Viramlander
 
NOEDITOR = FALSE
 
CONFIGURATIONS = 1
 
;<-------------------------GENERAL SETTINGS - Configuration: 0------------------------->
 
EMPTY_MASS = 1200
VSIZE = 10
PMI = 20 20 10
CSECTIONS = 20 20 20
GRAVITYGDAMP = 0
ROTDRAG = 0.01 0.01 0.01
 
;<-------------------------MESHES DEFINITIONS------------------------->
 
MESH_0_NAME = vIRAMLANDER3
MESH_0_POS = 0 0 0
MESH_0_DIR = 0 0 1
MESH_0_ROT = 0 1 0
MESH_0_VIS = 1
 
 
;<-------------------------DOCKS DEFINITIONS------------------------->
 
 
;<-------------------------ATTACHMENTS DEFINITIONS------------------------->
 
 
;<-------------------------ANIMATIONS DEFINITIONS------------------------->
 
;<-------------------------PROPELLANT DEFINITIONS------------------------->
 
PRP_0_ID = 0
PRP_0_MAXMASS = 1480
PRP_0_EFFICIENCY = 1
PRP_0_PRIMARY = TRUE
PRP_0_NAME = Tank_0
 
 
;<-------------------------THRUSTERS DEFINITIONS------------------------->
 
;<-------------------------THRUSTER GROUPS DEFINITIONS------------------------->
 
 
;<-------------------------TOUCHDOWNPOINTS DEFINITIONS------------------------->
 
TDP_1_0_POS = 0 -1.32 5.5
TDP_1_0_STIFFNESS = 14388
TDP_1_0_DAMPING = 10127.1
TDP_1_0_MU = 0.1
TDP_1_0_MULNG = 0.2
 
TDP_1_1_POS = -4.33013 -1.32 -2.5
TDP_1_1_STIFFNESS = 14388
TDP_1_1_DAMPING = 10127.1
TDP_1_1_MU = 3
TDP_1_1_MULNG = 0.2
 
TDP_1_2_POS = 4.33013 -1.32 -2.5
TDP_1_2_STIFFNESS = 14388
TDP_1_2_DAMPING = 10127.1
TDP_1_2_MU = 3
TDP_1_2_MULNG = 0.2
 
TDP_1_3_POS = 0 5 0
TDP_1_3_STIFFNESS = 14388
TDP_1_3_DAMPING = 10127.1
TDP_1_3_MU = 3
TDP_1_3_MULNG = 0.2

Viramlander:VesselBuilder1\Viramlander
STATUS Orbiting Sun
RPOS -142723395498.582 109304969.447 -46357522991.065
RVEL 2858104.1788 2241474.1345 -1682607.9608
AROT 104.023 26.767 134.587
VROT -14.4171 6.1901 4.9386
AFCMODE 7
PRPLEVEL 0:0.675676
NAVFREQ 0 0
END

Last edited by gattispilot; 09-11-2019 at 10:48 AM.
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Old 09-11-2019, 10:51 AM   #4
Abdullah Radwan
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I use this code to stop skidding on the ground for ShuttlePB. The rotation code is from fred18.

Code:
void ShuttlePB::clbkPreStep(double simt, double simdt, double mjd)
{
	if (!(GetFlightStatus() & 1) && GroundContact() && GetGroundspeed() <= 0.15 && !GetThrustVector(VECTOR3())) SetStatusLanded();
}

void ShuttlePB::SetStatusLanded()
{
	VESSELSTATUS2 status;
	memset(&status, 0, sizeof(status));
	status.version = 2;
	GetStatusEx(&status);
	status.status = 1;

	MATRIX3 rot1 = RotationMatrix({ 0 * RAD, 90 * RAD - status.surf_lng, 0 * RAD });
	MATRIX3 rot2 = RotationMatrix({ -status.surf_lat + 0 * RAD, 0, 0 * RAD });
	MATRIX3 rot3 = RotationMatrix({ 0, 0, 180 * RAD + status.surf_hdg });
	MATRIX3 rot4 = RotationMatrix({ 90 * RAD, 0, 0 });
	MATRIX3 RotMatrix_Def = mul(rot1, mul(rot2, mul(rot3, rot4)));

	status.arot.x = atan2(RotMatrix_Def.m23, RotMatrix_Def.m33);
	status.arot.y = -asin(RotMatrix_Def.m13);
	status.arot.z = atan2(RotMatrix_Def.m12, RotMatrix_Def.m11);
	status.vrot.x = 1.1; // The lander elevation from the ground

	DefSetStateEx(&status);
}

MATRIX3 ShuttlePB::RotationMatrix(VECTOR3 angles)
{
	MATRIX3 m;
	MATRIX3 RM_X, RM_Y, RM_Z;

	RM_X = _M(1, 0, 0, 0, cos(angles.x), -sin(angles.x), 0, sin(angles.x), cos(angles.x));
	RM_Y = _M(cos(angles.y), 0, sin(angles.y), 0, 1, 0, -sin(angles.y), 0, cos(angles.y));
	RM_Z = _M(cos(angles.z), -sin(angles.z), 0, sin(angles.z), cos(angles.z), 0, 0, 0, 1);

	m = mul(RM_X, mul(RM_Y, RM_Z));

	return m;
}
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Old 09-11-2019, 11:56 AM   #5
gattispilot
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Thanks. Those that can code can add that. But that doesn't address the issue of why that occurs.

I guess if it spins enough it ends up in orbit?
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Old 09-11-2019, 12:57 PM   #6
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Quote:
Originally Posted by gattispilot View Post
 Thanks. Those that can code can add that. But that doesn't address the issue of why that occurs.

I guess if it spins enough it ends up in orbit?
If you're asking about the skidding, it's a bug in Orbiter 2016 core.

Have you tried Fred18 touchdown code if you have problems with the touchdown points?
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Old 09-11-2019, 02:13 PM   #7
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Oh. Yes I have used Fred's code. But it spins in VB. But like you said it is a bug on the core
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Old 09-11-2019, 03:01 PM   #8
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Quote:
Originally Posted by gattispilot View Post
 Brakes on a lander?
Yes

Some parameters (friction?) only have effect when you apply brakes.
This is to allow for driving on the surface (like the DG) with brakes off.

So right after landing you apply brakes. The residual acceleration dampens goes to zero in a few seconds, and your vessel goes into a landed state.
Of course, if you land on a steep slope, your brake strength is not hold your vessel in place. In that case skidding or tumbling is normal.

That's how it works for the heavy lander example I posted.

Last edited by 4throck; 09-11-2019 at 03:08 PM.
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Old 09-11-2019, 03:07 PM   #9
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Oh. So what if we just increase the surface friction to a high number. So brake will be simulated?
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Old 09-11-2019, 07:28 PM   #10
4throck
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Brakes are separate from landing points and strength is in Newtons.
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Old 09-11-2019, 07:34 PM   #11
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So i was looking for brakes in the VB doc but didn't see it. Might have an older version
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Old 09-11-2019, 07:47 PM   #12
4throck
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Just to be clear, I was wrong here:
"Some parameters (friction?) only have effect when you apply brakes."

Brakes are separate from landing points and don't affect them.

---------- Post added at 20:47 ---------- Previous post was at 20:45 ----------

Quote:
Originally Posted by gattispilot View Post
 So i was looking for brakes in the VB doc but didn't see it. Might have an older version
Don't think Fred documented it, If I'm not mistaken it was one of the last things he added.
You have info about brakes on the SDK docs. Check page 414 of the API_Reference.pdf

----------------------------------

Here's a working VB light lander, 2000kg including fuel.

Code:
ClassName = VesselBuilder1
Module = VesselBuilder1
 
;CONFIGURATION FILE FOR light lander
 
NOEDITOR = FALSE
 
CONFIGURATIONS = 1
 
;<-------------------------GENERAL SETTINGS - Configuration: 0------------------------->
 
EMPTY_MASS = 1000
VSIZE = 10
PMI = 20 20 10
CSECTIONS = 20 20 20
GRAVITYGDAMP = 0
ROTDRAG = 0.01 0.01 0.01
 
;<-------------------------MESHES DEFINITIONS------------------------->
 
MESH_0_NAME = Carina
MESH_0_POS = 0 0 0.9
MESH_0_DIR = 0 0 1
MESH_0_ROT = 0 1 0
MESH_0_VIS = 1
 
 
;<-------------------------DOCKS DEFINITIONS------------------------->
 
 
;<-------------------------ATTACHMENTS DEFINITIONS------------------------->
 
 
;<-------------------------ANIMATIONS DEFINITIONS------------------------->
 
;<-------------------------PROPELLANT DEFINITIONS------------------------->
 
PRP_0_ID = 0
PRP_0_MAXMASS = 1000
PRP_0_EFFICIENCY = 1
PRP_0_PRIMARY = TRUE
PRP_0_NAME = Tank_0
 
 
;<-------------------------THRUSTERS DEFINITIONS------------------------->
 
THR_0_ID = 0
THR_0_NAME = Pitch_up_1
THR_0_POS = 0 0 10
THR_0_DIR = 0 1 0
THR_0_MAX0 = 104.72
THR_0_ISP0 = 1e+007
THR_0_ISPREF = 0
THR_0_PREF = 101400
THR_0_TANK = 0
THR_0_HASEXHAUST = FALSE
THR_0_HASPARTICLES = FALSE
 
THR_1_ID = 1
THR_1_NAME = Pitch_up_2
THR_1_POS = 0 0 -10
THR_1_DIR = 0 -1 0
THR_1_MAX0 = 104.72
THR_1_ISP0 = 1e+007
THR_1_ISPREF = 0
THR_1_PREF = 101400
THR_1_TANK = 0
THR_1_HASEXHAUST = FALSE
THR_1_HASPARTICLES = FALSE
 
THR_2_ID = 2
THR_2_NAME = Pitch_dwn_1
THR_2_POS = 0 0 10
THR_2_DIR = 0 -1 0
THR_2_MAX0 = 104.72
THR_2_ISP0 = 1e+007
THR_2_ISPREF = 0
THR_2_PREF = 101400
THR_2_TANK = 0
THR_2_HASEXHAUST = FALSE
THR_2_HASPARTICLES = FALSE
 
THR_3_ID = 3
THR_3_NAME = Pitch_dwn_2
THR_3_POS = 0 0 -10
THR_3_DIR = 0 1 0
THR_3_MAX0 = 104.72
THR_3_ISP0 = 1e+007
THR_3_ISPREF = 0
THR_3_PREF = 101400
THR_3_TANK = 0
THR_3_HASEXHAUST = FALSE
THR_3_HASPARTICLES = FALSE
 
THR_4_ID = 4
THR_4_NAME = Yaw_left_1
THR_4_POS = 0 0 10
THR_4_DIR = -1 0 0
THR_4_MAX0 = 104.72
THR_4_ISP0 = 1e+007
THR_4_ISPREF = 0
THR_4_PREF = 101400
THR_4_TANK = 0
THR_4_HASEXHAUST = FALSE
THR_4_HASPARTICLES = FALSE
 
THR_5_ID = 5
THR_5_NAME = Yaw_left_2
THR_5_POS = 0 0 -10
THR_5_DIR = 1 0 0
THR_5_MAX0 = 104.72
THR_5_ISP0 = 1e+007
THR_5_ISPREF = 0
THR_5_PREF = 101400
THR_5_TANK = 0
THR_5_HASEXHAUST = FALSE
THR_5_HASPARTICLES = FALSE
 
THR_6_ID = 6
THR_6_NAME = Yaw_right_1
THR_6_POS = 0 0 10
THR_6_DIR = 1 0 0
THR_6_MAX0 = 104.72
THR_6_ISP0 = 1e+007
THR_6_ISPREF = 0
THR_6_PREF = 101400
THR_6_TANK = 0
THR_6_HASEXHAUST = FALSE
THR_6_HASPARTICLES = FALSE
 
THR_7_ID = 7
THR_7_NAME = Yaw_right_2
THR_7_POS = 0 0 -10
THR_7_DIR = -1 0 0
THR_7_MAX0 = 104.72
THR_7_ISP0 = 1e+007
THR_7_ISPREF = 0
THR_7_PREF = 101400
THR_7_TANK = 0
THR_7_HASEXHAUST = FALSE
THR_7_HASPARTICLES = FALSE
 
THR_8_ID = 8
THR_8_NAME = Bank_left_1
THR_8_POS = 10 0 0
THR_8_DIR = 0 1 0
THR_8_MAX0 = 52.3599
THR_8_ISP0 = 1e+007
THR_8_ISPREF = 0
THR_8_PREF = 101400
THR_8_TANK = 0
THR_8_HASEXHAUST = FALSE
THR_8_HASPARTICLES = FALSE
 
THR_9_ID = 9
THR_9_NAME = Bank_left_2
THR_9_POS = -10 0 0
THR_9_DIR = 0 -1 0
THR_9_MAX0 = 52.3599
THR_9_ISP0 = 1e+007
THR_9_ISPREF = 0
THR_9_PREF = 101400
THR_9_TANK = 0
THR_9_HASEXHAUST = FALSE
THR_9_HASPARTICLES = FALSE
 
THR_10_ID = 10
THR_10_NAME = Bank_right_1
THR_10_POS = 10 0 0
THR_10_DIR = 0 -1 0
THR_10_MAX0 = 52.3599
THR_10_ISP0 = 1e+007
THR_10_ISPREF = 0
THR_10_PREF = 101400
THR_10_TANK = 0
THR_10_HASEXHAUST = FALSE
THR_10_HASPARTICLES = FALSE
 
THR_11_ID = 11
THR_11_NAME = Bank_right_2
THR_11_POS = -10 0 0
THR_11_DIR = 0 1 0
THR_11_MAX0 = 52.3599
THR_11_ISP0 = 1e+007
THR_11_ISPREF = 0
THR_11_PREF = 101400
THR_11_TANK = 0
THR_11_HASEXHAUST = FALSE
THR_11_HASPARTICLES = FALSE
 
THR_12_ID = 12
THR_12_NAME = Translate_up
THR_12_POS = 0 0 0
THR_12_DIR = 0 1 0
THR_12_MAX0 = 300
THR_12_ISP0 = 1e+007
THR_12_ISPREF = 0
THR_12_PREF = 101400
THR_12_TANK = 0
THR_12_HASEXHAUST = FALSE
THR_12_HASPARTICLES = FALSE
 
THR_13_ID = 13
THR_13_NAME = Translate_dwn
THR_13_POS = 0 0 0
THR_13_DIR = 0 -1 0
THR_13_MAX0 = 300
THR_13_ISP0 = 1e+007
THR_13_ISPREF = 0
THR_13_PREF = 101400
THR_13_TANK = 0
THR_13_HASEXHAUST = FALSE
THR_13_HASPARTICLES = FALSE
 
THR_14_ID = 14
THR_14_NAME = Translate_left
THR_14_POS = 0 0 0
THR_14_DIR = -1 0 0
THR_14_MAX0 = 300
THR_14_ISP0 = 1e+007
THR_14_ISPREF = 0
THR_14_PREF = 101400
THR_14_TANK = 0
THR_14_HASEXHAUST = FALSE
THR_14_HASPARTICLES = FALSE
 
THR_15_ID = 15
THR_15_NAME = Translate_right
THR_15_POS = 0 0 0
THR_15_DIR = 1 0 0
THR_15_MAX0 = 300
THR_15_ISP0 = 1e+007
THR_15_ISPREF = 0
THR_15_PREF = 101400
THR_15_TANK = 0
THR_15_HASEXHAUST = FALSE
THR_15_HASPARTICLES = FALSE
 
THR_16_ID = 16
THR_16_NAME = Translate_forward
THR_16_POS = 0 0 0
THR_16_DIR = 0 0 1
THR_16_MAX0 = 30000
THR_16_ISP0 = 1e+007
THR_16_ISPREF = 0
THR_16_PREF = 101400
THR_16_TANK = 0
THR_16_HASEXHAUST = FALSE
THR_16_HASPARTICLES = FALSE
 
THR_17_ID = 17
THR_17_NAME = Translate_backward
THR_17_POS = 0 0 0
THR_17_DIR = 0 0 -1
THR_17_MAX0 = 300
THR_17_ISP0 = 1e+007
THR_17_ISPREF = 0
THR_17_PREF = 101400
THR_17_TANK = 0
THR_17_HASEXHAUST = FALSE
THR_17_HASPARTICLES = FALSE
 
;<-------------------------THRUSTER GROUPS DEFINITIONS------------------------->
 
THGROUP_MAIN = TRUE
THGROUP_MAIN_THRUSTERS = 16
THGROUP_RETRO = TRUE
THGROUP_RETRO_THRUSTERS = 17
THGROUP_HOVER = TRUE
THGROUP_HOVER_THRUSTERS = 12
THGROUP_ATT_PITCHUP = TRUE
THGROUP_ATT_PITCHUP_THRUSTERS = 0, 1
THGROUP_ATT_PITCHDOWN = TRUE
THGROUP_ATT_PITCHDOWN_THRUSTERS = 2, 3
THGROUP_ATT_YAWLEFT = TRUE
THGROUP_ATT_YAWLEFT_THRUSTERS = 4, 5
THGROUP_ATT_YAWRIGHT = TRUE
THGROUP_ATT_YAWRIGHT_THRUSTERS = 6, 7
THGROUP_ATT_BANKLEFT = TRUE
THGROUP_ATT_BANKLEFT_THRUSTERS = 8, 9
THGROUP_ATT_BANKRIGHT = TRUE
THGROUP_ATT_BANKRIGHT_THRUSTERS = 10, 11
THGROUP_ATT_RIGHT = TRUE
THGROUP_ATT_RIGHT_THRUSTERS = 15
THGROUP_ATT_LEFT = TRUE
THGROUP_ATT_LEFT_THRUSTERS = 14
THGROUP_ATT_UP = TRUE
THGROUP_ATT_UP_THRUSTERS = 12
THGROUP_ATT_DOWN = TRUE
THGROUP_ATT_DOWN_THRUSTERS = 13
THGROUP_ATT_FORWARD = TRUE
THGROUP_ATT_FORWARD_THRUSTERS = 16
THGROUP_ATT_BACK = TRUE
THGROUP_ATT_BACK_THRUSTERS = 17
 
;<-------------------------TOUCHDOWNPOINTS DEFINITIONS------------------------->
 
TDP_1_0_POS = 1.73205 -1 -0.1
TDP_1_0_STIFFNESS = 13080
TDP_1_0_DAMPING = 9206.43
TDP_1_0_MU = 3
TDP_1_0_MULNG = 0.2
 
TDP_1_1_POS = -1.73205 -1 -0.1
TDP_1_1_STIFFNESS = 13080
TDP_1_1_DAMPING = 9206.43
TDP_1_1_MU = 3
TDP_1_1_MULNG = 0.2
 
TDP_1_2_POS = 0 2 -0.1
TDP_1_2_STIFFNESS = 13080
TDP_1_2_DAMPING = 9206.43
TDP_1_2_MU = 3
TDP_1_2_MULNG = 0.2
 
TDP_1_3_POS = 0 0 2
TDP_1_3_STIFFNESS = 13080
TDP_1_3_DAMPING = 9206.43
TDP_1_3_MU = 3
TDP_1_3_MULNG = 0.2
 
 
;<-------------------------AIRFOILS DEFINITIONS------------------------->
 
 
;<-------------------------CONTROL SURFACES DEFINITIONS------------------------->
 
 
;<-------------------------CAMERA DEFINITIONS------------------------->
 
 
;<-------------------------VIRTUAL COCKPIT DEFINITIONS------------------------->
 
 
;<-------------------------LIGHTS: BEACONS DEFINITIONS------------------------->
 
 
;<-------------------------LIGHTS: LIGHT EMITTERS DEFINITIONS------------------------->
 
 
;<-------------------------VARIABLE DRAG ITEMS DEFINITIONS------------------------->
 
 
;<-------------------------EVENTS DEFINITIONS------------------------->
 
 
;<-------------------------EXHAUST TEXTURES DEFINITIONS------------------------->
 
 
;<-------------------------PARTICLES DEFINITIONS------------------------->

Last edited by 4throck; 09-12-2019 at 12:03 AM.
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Old 09-12-2019, 09:22 AM   #13
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I didn't see a brake setting in that cfg?

I fired up my lander and although it didn't lift off it move and then stop. no spinning

Which is the latest VB?

Last edited by gattispilot; 09-12-2019 at 12:32 PM.
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Old 09-12-2019, 04:39 PM   #14
4throck
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The latest version is "VesselBuilder1_PreRelease".

There's no specific parameter for brakes I think. But it's discussed here (with an update):
https://www.orbiter-forum.com/showth...&postcount=351
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