SpiderPig

July 28, 2018

You use the plane like a Vec3. The constructor can take three positions to define it, then you can use functions like GetNormal() and DistanceToPoint().

I imagine the positions as forming a triangle, and the plane extending out from that in all directions.

Vec3 p1 = Vec3(-1.0f, -1.0f, -1.0f);
Vec3 p2 = Vec3(0.0f, 1.0f, 1.0f);
Vec3 p3 = Vec3(1.0f, 0.0f, 0.0f);

Plane plane = Plane(p1, p2, p3);
Vec3 normal = plane.GetNormal();
float distance = plane.DistanceToPoint(2, 1, 0);

I'm not sure how to define it using the other constructors as shown in the example in Transform::Plane()

July 27, 2018

Here's my attempt so far at making my own character controller. The reason for this is because I'm using multiple gravity directions in the same world and the current controller doesn't like gravity in any direction other than down the y axis.

The problem I'm having is getting the controller to stay constrained to the up axis, when you move it with speed (shift key) you'll see that it drags across the terrain and bounces around. I'm not sure how to correctly use the joints settings to stop this kind of movement. Any help is appreciated.

#include "App.h"

using namespace Leadwerks;

App::App() : window(NULL), context(NULL), world(NULL), camera(NULL) {}

App::~App() { delete world; delete window; }

float lookspeed = 0.1, looksmoothing = 0.5;
Vec3 mousepos;

float jointpos = 1;
bool wireframe = false;
Joint* joint;
Entity* parent;

Joint* k = nullptr;
Entity* child;

bool App::Start()
{
	window = Leadwerks::Window::Create();
	context = Context::Create(window);
	world = World::Create();
	camera = Camera::Create();
	camera->Move(0, 0, -4);
	Light* light = DirectionalLight::Create();
	light->SetRotation(35, 35, 0);

	parent = Model::Box();
	parent->SetColor(0.0, 0.0, 1.0);
	parent->SetMass(1);
	parent->SetGravityMode(false);

	child = Model::Box();
	child->SetColor(1.0, 0.0, 0.0);
	child->SetShape(Shape::Box());
	child->SetMass(1);
	child->SetGravityMode(true);

	k = Joint::Kinematic(0, 0, 0, parent);

	joint = Joint::Slider(0, 0, 0, 0, 1, 0, child, parent);
	joint->EnableLimits();
	joint->SetLimits(-5, 5);
	joint->SetMotorSpeed(100);

	Model* mdl = Model::Load("Models\\Terrain.mdl");
	mdl->SetScale(20, 20, 20);
	mdl->SetPosition(0, -3, 0);

	Shape* shp = Shape::PolyMesh(mdl->GetSurface(0));
	mdl->SetShape(shp);

	mousepos = window->GetMousePosition();
	window->SetMousePosition(context->GetWidth() / 2, context->GetHeight() / 2);

	return true;
}

bool App::Loop()
{
	if (window->Closed() || window->KeyDown(Key::Escape)) return false;
	if (window->KeyHit(Key::F3) == true) { camera->GetDebugPhysicsMode() == true ? camera->SetDebugPhysicsMode(false) : camera->SetDebugPhysicsMode(true); }
	if (window->KeyHit(Key::F4) == true) { camera->GetDebugEntityBoxesMode() == true ? camera->SetDebugEntityBoxesMode(false) : camera->SetDebugEntityBoxesMode(true); }
	if (window->KeyHit(Key::F2) == true)
	{
		if (wireframe == true)
		{
			camera->SetDrawMode(0);
			wireframe = false;
		}
		else
		{
			camera->SetDrawMode(2);
			wireframe = true;
		}
	}

	float cx = Math::Round(context->GetWidth() / 2);
	float cy = Math::Round(context->GetHeight() / 2);
	Vec3 mpos = window->GetMousePosition();
	window->SetMousePosition(cx, cy);
	mpos = mpos * looksmoothing + mousepos * (1 - looksmoothing);
	float dx = (mpos.x - cx) * lookspeed;
	float dy = (mpos.y - cy) * lookspeed;

	Vec3 camrot = camera->GetRotation();
	camrot.x += dy;
	camrot.y += dx;
	camera->SetRotation(camrot);
	mousepos = mpos;

	float _time = Time::GetSpeed();
	float camspeed = 0.2f * _time;
	if (window->KeyDown(Key::Shift) == true) { camspeed = camspeed * 5.0f; }
	if (window->KeyDown(Key::W) == true) { camera->Move(0, 0, camspeed); }
	else if (window->KeyDown(Key::S) == true) { camera->Move(0, 0, -camspeed); }
	if (window->KeyDown(Key::A) == true) { camera->Move(-camspeed, 0, 0); }
	else if (window->KeyDown(Key::D) == true) { camera->Move(camspeed, 0, 0); }
	if (window->KeyDown(Key::T) == true) { camera->Move(0, camspeed, 0); }
	else if (window->KeyDown(Key::G) == true) { camera->Move(0, -camspeed, 0); }

	Vec3 p = parent->GetPosition(true);
	Vec3 r = parent->GetRotation(true);
	float speed = 0.1f;
	if (window->KeyDown(Key::Shift) == true) { speed = 1.0f; }
	if (window->KeyDown(Key::Up)) { k->SetTargetPosition(p.x, p.y, p.z + speed); }
	if (window->KeyDown(Key::Down)) { k->SetTargetPosition(p.x, p.y, p.z - speed); }
	if (window->KeyDown(Key::Left)) { k->SetTargetPosition(p.x - speed, p.y, p.z); }
	if (window->KeyDown(Key::Right)) { k->SetTargetPosition(p.x + speed, p.y, p.z); }

	//Jumping...?
	joint->SetAngle(jointpos);
	if (joint->MotorEnabled() == true)
	{
		joint->DisableMotor();
	}
	if (window->KeyHit(Key::Space))
	{
		joint->EnableMotor();
	}

	Leadwerks::Time::Update();
	world->Update();
	world->Render();

	context->SetBlendMode(Blend::Alpha);
	context->DrawText("Target position: " + String(jointpos), 0, 0);
	context->DrawText("Current position: " + String(joint->GetAngle()), 0, 20);
	context->DrawText("Motor enabled: " + String(joint->MotorEnabled()), 0, 40);
	context->SetBlendMode(Blend::Solid);

	context->Sync();

	return true;
}

Other links;

https://www.leadwerks.com/community/topic/17437-physics-constraints/

Project.zip

July 26, 2018

I think I once had this problem... I think it was something to do with my display settings, nothing wrong with Leadwerks. Or even update your graphics driver. I have a feeling some antivirus software can cause odd things to happen as well. AVG did that to me.

EDIT : Just saw its been solved. I think its bed time. ?

July 26, 2018

I've not created metal materials before but if not the "diffuse+normal+specular" shader it might be the "diffuse+normal+specular+env" shader, where texture5 is a cube map that the object will reflect, perhaps making it look more like metal.

July 24, 2018

You would use Sin () and Cos () to find the x and y position.

Is alpha a constant? Like 90°?

Do the red and blue positions vary in the third dimension as well? Or are you looking for the 2D position only of the black?

July 20, 2018

Is this the correct way to use it?

//Header.h
class CustomActor : public Actor
{
public:
	virtual void UpdatePhysics();
};

//CPP.cpp
void CustomActor::UpdatePhysics()
{
	//Do Stuff
}

July 19, 2018

Have now

July 19, 2018

Thank you, it works well.

July 19, 2018

#include "App.h"

using namespace Leadwerks;

App::App() : window(NULL), context(NULL), world(NULL), camera(NULL) {}

App::~App() { delete world; delete window; }

float jointpos = 1;
bool wireframe = false;
Joint* joint;
Entity* parent;

bool App::Start()
{
	window = Leadwerks::Window::Create();
	context = Context::Create(window);
	world = World::Create();
	camera = Camera::Create();
	camera->Move(0, 0, -4);
	Light* light = DirectionalLight::Create();
	light->SetRotation(35, 35, 0);

	parent = Model::Box();
	parent->SetColor(0.0, 0.0, 1.0);

	Entity* child = Model::Box();
	child->SetColor(1.0, 0.0, 0.0);
	child->SetShape(Shape::Box());
	child->SetMass(1);
	child->SetFriction(0, 0);
	child->SetGravityMode(true);

	joint = Joint::Slider(0, 0, 0, 0, 1, 0, child, parent);
	joint->EnableLimits();
	joint->SetLimits(-3, 1);

	Model* mdl = Model::Box();
	mdl->SetScale(10, 0.1, 10);
	mdl->SetPosition(0, -2, 0);

	Shape* shp = Shape::Box();
	mdl->SetShape(shp);

	return true;
}

bool App::Loop()
{
	if (window->Closed() || window->KeyDown(Key::Escape)) return false;
	if (window->KeyHit(Key::F3) == true) { camera->GetDebugPhysicsMode() == true ? camera->SetDebugPhysicsMode(false) : camera->SetDebugPhysicsMode(true); }
	if (window->KeyHit(Key::F4) == true) { camera->GetDebugEntityBoxesMode() == true ? camera->SetDebugEntityBoxesMode(false) : camera->SetDebugEntityBoxesMode(true); }
	if (window->KeyHit(Key::F2) == true)
	{
		if (wireframe == true)
		{
			camera->SetDrawMode(0);
			wireframe = false;
		}
		else
		{
			camera->SetDrawMode(2);
			wireframe = true;
		}
	}

	if (window->KeyDown(Key::Up)) { parent->Move(0, 0, 0.1); }
	if (window->KeyDown(Key::Down)) { parent->Move(0, 0, -0.1); }
	if (window->KeyDown(Key::Left)) { parent->Move(-0.1, 0, 0); }
	if (window->KeyDown(Key::Right)) { parent->Move(0.1, 0, 0); }

	joint->SetAngle(jointpos);
	if (window->KeyHit(Key::Space))
	{
		if (!joint->MotorEnabled())
		{
			joint->EnableMotor();
		}
		else
		{
			joint->DisableMotor();
		}
	}

	Leadwerks::Time::Update();
	world->Update();
	world->Render();

	context->SetBlendMode(Blend::Alpha);
	context->DrawText("Target position: " + String(jointpos), 0, 0);
	context->DrawText("Current position: " + String(joint->GetAngle()), 0, 20);
	context->DrawText("Motor enabled: " + String(joint->MotorEnabled()), 0, 40);
	context->SetBlendMode(Blend::Solid);

	context->Sync();

	return true;
}

Using the arrows keys to move the sliders parent around you can see that the child takes time to realign itself. Is it possible to stop this delay?

July 19, 2018

You can only add lua script in that box.

July 16, 2018

Can this be made a smart pointer so delete doesn't have to be called?

int* index = new int[1024];

Or are smart pointers only for creating things like classes?

July 14, 2018

What's the best way to add physics constraints to a custom player controller? For example, the cylinder shape is pulled toward gravity (which is not always straight down) then collides with an object, how do I stop little movements like sliding and twisting once it collides?

As far as I can tell, the inbuilt character controller only slides if the slope is greater than max slope. And when it moves around by key press it doesn't rotate left or right or jitter as it goes over various sloped polygons.

Gravity is added like so in a different class to the controller;

float _force = -9.8f;
entity->AddForce(_gravity->gravityDirection.x * _force, _gravity->gravityDirection.y * _force, _gravity->gravityDirection.z * _force);		//gravityDirection is a normalized vector

And so far for the controller I've been doing this to make it move;

Vec3 _velocity = entity->GetVelocity(true);					//Get the current velocity
Vec3 _gravityVelocity = _velocity.Multiply(upDirection);			//Find how much of the velocity is along the gravity vector
Vec3 _otherVelocity = _velocity.Subtract(_gravityVelocity);			//Any remaining velocity other than gravity

Vec3 _forwardVelocity = _forwardVector * move;					//A vector in front of the player and perpindicular to gravity
Vec3 _strafeVelocity = _strafeVector * strafe;					//A vector that is the cross of gravity and the forward vector (out to the side)
Vec3 _jumpVelocity = upDirection * jump;					//GravityDirection * -1.0f
movementVector = _forwardVelocity + _strafeVelocity + _jumpVelocity;		//Find total movement vector (don't normalize, magnitude is speed)
entity->SetVelocity((_velocity - _otherVelocity) + movementVector, true);	//Subtract othervelocity to get only what gravity is, then add any movemnt
entity->SetOmega(0.0f, 0.0f, 0.0f, true);					//Been using this to reduce angular rotation, not perfect though

The above code has issues still, but it's my attempt at constraining it along gravity unless needed to move. This code isn't done in a physics hook, which I was wondering if that might be better?

And here's a quick video showing the physic shape jittering. It doesn't translate to the camera much at the moment but it does when the jitter is larger. Also I can't move the shape along it's local axis because of the jitter and the random rotation that happens as a result of moving.

https://youtu.be/ZA_UNsYCEQs

Any thoughts on more accurate ways of constraining are appreciated

July 13, 2018

Thanks macklebee, turning off z-sort fixed it. I am placing the trees manually as I've got my own terrain generator.

July 13, 2018

Updated my driver from 397.64 to the latest 398.36 for w10 64 bit and it didn't fix it. ?

July 13, 2018

I have GTX 980 TI. Checking drivers now. MSAA was 4x, I turned it off and the problem disappeared. Nvidia problem do you think?

July 13, 2018

What would cause the background to seep through the leaves? I've attached the two materials of the trees.

PineTreeLeaves.mat

PineTreeTrunk.mat

July 12, 2018

Glad you got it working. Your code at the moment is very inefficient. You should structure it like this;

...	
world->Render();


//DRAW FPS
context->SetBlendMode(Blend::Alpha);
context->SetColor(1, 0, 0, 1);								//Use values 0.0 to 1.0
context->DrawText("FPS : " + String(Time::UPS()), 10, 20);

PickInfo pickInfo;
bool success = world->Pick(rayCastFirst, rayCastEnd, pickInfo);
if(success == true)
{
      //DRAW LINE
      Vec3 firstPos = camera->Project(rayCastFirst);
      Vec3 lastPos = camera->Project(rayCastEnd); 
      context->DrawLine(firstPos.x, firstPos.y, lastPos.x, lastPos.y);

      //DRAW KEY VALUE
      context->SetColor(1, 1, 1, 1);
      context->DrawText(pickInfo.entity->GetKeyValue("Color"), 20, 40);
}

//set sphere to hit
hitSphere->SetPosition((success == true) ? (pickInfo.position) : (rayCastFirst));

context->SetBlendMode(Blend::Solid);
context->Sync(true);

...

July 11, 2018

Ah I see it now, your doing a pick again but this time the sphere is in the way. Try setting the spheres pick mode to '0' I think it is... or what would be better is to do the check once.

bool success = world->Pick(rayCastFirst, rayCastEnd, pickInfo, 0, true);

//Now use pickInfo

July 11, 2018

Try printing some other text first, that will tell you if the world->pick has succeeded. And maybe the entity doesn't have keyvalue named Color?

July 11, 2018

This is probably more a question for Josh, but does anyone know how to use the CharacterController class by itself and not by using SetCollisionType() on an entity?

I'm trying to create a controller and update forces on it myself, like so;

//Create
auto b = Model::Box();
auto cont = CharacterController::Create(b);

//Update
cont->addForce(-1.0f,0.0f,0.0f);

July 11, 2018

That could be an option, although I'm more thinking of a character walking on the ground and on the wall I'm experimenting at the moment but had no luck so far.

July 11, 2018

Can the gravity direction be changed on a per object basis rather than per world? I'd like to change the direction for the character controller. Would it be possible to turn off the world gravity and add forces to the controller object, or will this mess things up? ?

July 5, 2018

I'm not sure on the exact repercussions but Time:Pause() doesn't look right to me. Why is this here?

July 2, 2018

Tried again, setting all of them to massive numbers like 10,000 but nothing changes...

July 2, 2018

He's saying we need an example project or the code so we can reproduce the error. I usally create a new project and do the bare minimum that shows the error happing. ?

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