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Messages - iblis

Pages: [1]
1
Support / Re: Moving spot light
« on: January 21, 2013, 07:31:01 pm »
The direction is correct :) JPCT coordinates != OpenGL coordinates :)
But sth is wrong with position.
Code: [Select]
car.carBody.object3d.getTransformedCenter(position);
light.setPosition(position);
The position of the red box is 0, 0, 0.

The car (bigger red box) moved  to 0, 0, -20. The light changed x and z coordinates.

2
Support / Re: Moving spot light
« on: January 21, 2013, 02:41:50 pm »
"lightPositions[8]"? Should I use Light class and set position of lights like this?
Code: [Select]
this.carBody.object3d.getTransformedCenter(position);
light.setPosition(position);
Does the Light class set "lightPositions[8]"?
This a result.

The light rotates with the camera ;/ But it should rotate with the car. Moreover the car moves right, but the light moves left. I think it works the same earlier.
Vertex Shader:

Code: [Select]
uniform mat4 modelViewMatrix;
uniform mat4 modelViewProjectionMatrix;
uniform vec3 lightPositions[8];


uniform vec3 lightDir[2];

attribute vec4 position;
attribute vec3 normal;

varying vec3 eyeMV;
varying vec3 normalMV;
//I want to use 2 lights, but one is easier to test
varying vec3 lightPosMV[2];
varying vec3 lightDirMV[2];

void main(void)
{
normalMV = normalize(modelViewMatrix * vec4(normal, 0.0)).xyz;

vec3 vertex = (modelViewMatrix * position).xyz;
eyeMV = -vertex;


lightDirMV[0] = normalize(lightDir[0]);
lightPosMV[0] = normalize(lightPositions[0] - vertex);

gl_Position = modelViewProjectionMatrix * position;
}

3
Support / Re: Moving spot light
« on: January 20, 2013, 10:30:42 pm »
 Sth is wrong all the time. The problem is connected with the position of the light (or vector to the light).

Java
Code: [Select]
public void vectorWorldToCameraSpace(SimpleVector vector,
SimpleVector toFill) {

Camera cam = world.getCamera();
toFill.set(vector);
Matrix back = cam.getBack();
toFill.matMul(back);
}

private void setUpLights() {
GLSLShader phong = this.shaders.get("phong");
this.world.setGlobalShader(phong);

SimpleVector dir[] = new SimpleVector[] {
SimpleVector.create(0.0f, 0.0f, 1.0f),
SimpleVector.create(0.0f, 0.0f, 1.0f) };

for (int i = 0; i < 2; i++) {

box.getTransformedCenter(pos[i]); //So light should be in the center of box (0, 0, 0)
vectorWorldToCameraSpace(pos[i], posBuf[i]);
vectorWorldToCameraSpace(dir[i], dirBuf[i]);
}
phong.setUniform("lightPos", posBuf);
phong.setUniform("lightDir", dirBuf);

}Vertex Shader
Code: [Select]
uniform mat4 modelViewMatrix;
uniform mat4 modelViewProjectionMatrix;


uniform vec3 lightPos[2];
uniform vec3 lightDir[2];

attribute vec4 position;
attribute vec3 normal;

varying vec3 eyeMV;
varying vec3 normalMV;
//I want to use 2 lights, but one is easier to test
varying vec3 lightPosMV[2];
varying vec3 lightDirMV[2];

void main(void)
{
normalMV = normalize(modelViewMatrix * vec4(normal, 0.0)).xyz;

vec3 vertex = (modelViewMatrix * position).xyz;
eyeMV = -vertex;

for(int i = 0; i < 2; i++){
    lightDirMV[i] = normalize(lightDir[i]);
    vec3 light = lightPos[i];
    lightPosMV[i] = normalize(light - vertex);
}
gl_Position = modelViewProjectionMatrix * position;
}Fragment Shader
Code: [Select]
precision mediump float;

varying vec3 normalMV;
varying vec3 lightPosMV[2];
varying vec3 lightDirMV[2];

const float outerSpot = 0.6;
const vec3 ambient = vec3(0.2, 0.2, 0.2);
const vec3 diffuse = vec3(0.7, 0.7, 0.7);

void main(void)
{
    vec4 color = vec4(ambient, 1.0);
    vec3 normalN = normalize(normalMV);

    for(int i = 0; i < 1; i++){
    vec3 lightPosN = normalize(lightPosMV[i]);
    vec3 lightDirN = normalize(lightDirMV[i]);
    float diff = dot(normalN, lightPosN);

    if(diff >= 0.0){
        float spot = dot(-lightPosN, lightDirN);
        if(spot > outerSpot){
            color += vec4(diff * diffuse, 0.0);
        }
    }
    }
    gl_FragColor =clamp(color, 0.0, 1.0);
}

4
Support / Re: Moving spot light
« on: January 20, 2013, 11:56:28 am »
I just need 2-3 lights.
Could you explain me how to calculate camera direction. I can't multiply camera's position and direction by modelViewMatrix because it contains object's transformation.

5
Support / Moving spot light
« on: January 19, 2013, 10:59:55 pm »
I need to create spot light (It will be car's light). I want it to look like here http://www.youtube.com/watch?v=7Xx_Rk6wXqU .
I think I should calculate the modelViewMatrix for light (light moves with carBody, so it would be the same matrix), save it as lightMatrix0 and transform light position in each vertex transformation.. but it doesn't work. I've found here http://www.jpct.net/forum2/index.php/topic,2368.0.html how calculate model view matrix:
Code: [Select]
mo.setTo(transBuffer);
mat.setTo(cam.getBack());
mat.transformToGL();
mo.translate(-cam.backBx, -cam.backBy, -cam.backBz);
mo.matMul(mat);Is it correct? Maybe I do sth wrong?

Vertex Shader:
Code: [Select]
uniform mat4 modelViewMatrix;
uniform mat4 modelViewProjectionMatrix;

uniform mat4 lightMatrix0; //in my opinion here should be light's model view matrix
uniform vec3 lightPos[2];
uniform vec3 lightDir[2];

attribute vec4 position;
attribute vec3 normal;

varying vec3 eyeMV;
varying vec3 normalMV;
//I want to use 2 lights, but one is easier to test
varying vec3 lightPosMV[2];
varying vec3 lightDirMV[2];

void main(void)
{
normalMV = normalize(modelViewMatrix * vec4(normal, 0.0)).xyz;

vec3 vertex = (modelViewMatrix * position).xyz;
eyeMV = -vertex;

mat4 lightMatrix[2];
lightMatrix[0] = lightMatrix0;

for(int i = 0; i < 1; i++){
    lightDirMV[i] = normalize(lightMatrix[i]* vec4(lightDir[i], 0.0)).xyz;
    vec3 light =normalize( lightMatrix[i] * vec4(lightPos[i], 0.0)).xyz;
    lightPosMV[i] = normalize(light - vertex);
}
gl_Position = modelViewProjectionMatrix * position;
}Fragment Shader
Code: [Select]
precision mediump float;

uniform vec3 lightDir[2];
varying vec3 eyeMV;
varying vec3 normalMV;
varying vec3 lightPosMV[2];
varying vec3 lightDirMV[2];

const float outerSpot = 0.6;
const float specExp = 64.0;
const vec3 ambient = vec3(0.3, 0.3, 0.3);
const vec3 diffuse = vec3(0.7, 0.7, 0.7);
const vec3 specular = vec3(1.0, 1.0, 1.0);

void main(void)
{
    vec4 color = vec4(ambient, 1.0);
    vec3 eyeN = normalize(eyeMV);
    vec3 normalN = normalize(normalMV);

    for(int i = 0; i < 1; i++){
    vec3 lightPosN = normalize(lightPosMV[i]);
    vec3 lightDirN = normalize(lightDirMV[i]);
    float diff = dot(normalN, lightPosN);

    if(diff >= 0.0){
        float spot = dot(-lightPosN, lightDirN);
        if(spot > outerSpot){
            color += vec4(diff * diffuse, 0.0);
            vec3 ref = normalize(reflect(-lightPosN, normalN));
            float spec = max(0.0, dot(eyeN, ref));
            float buf = pow(spec, specExp);
            color +=  vec4(specular * buf, 0.0);
        }
    }
    }
    gl_FragColor =clamp(color, 0.0, 1.0);
}Java
Code: [Select]
Matrix light2[] = new Matrix[]{
new Matrix(), new Matrix()
};

Matrix matrixBuf = new Matrix();

private void setUpLights(Car cars[]) {
GLSLShader phong = this.shaders.get("phong");
this.world.setGlobalShader(phong);

Camera camera = world.getCamera();
camera.getPosition(buf);
for (int i = 0; i < 1; i++) {
// I've relied on http://www.jpct.net/forum2/index.php/topic,2368.0.html Is it really create the model view matrix correctly?

cars[i].carBody.object3d.getWorldTransformation(matrixBuf);
light2[i].setTo(matrixBuf);
mat.setTo(camera.getBack());
mat.transformToGL();

light2[i].translate(-buf.x, -buf.y, -buf.z);
light2[i].matMul(mat);

phong.setUniform("lightMatrix"+i, light2[i]);
}
phong.setUniform("lightPos", new SimpleVector[]
{ SimpleVector.create(0.0f, 0.5f, 0.0f), SimpleVector.create(0.0f, 0.5f, 0.0f)});
phong.setUniform("lightDir", new SimpleVector[]
{ SimpleVector.create(0.0f, 0.0f, -1.0f), SimpleVector.create(0.0f, 0.0f, -1.0f)});

}

6
Support / Re: jPCT-AE + JBullet vehicle
« on: January 02, 2013, 06:08:10 pm »
ok.. It's working. I didn't notice that the wheel's connection point is in chassis coordinate system and it shouldn't be translated.

However I've got another problem: wheels vibrate all the time. The car body doesn't move, but wheels jump. The translation vector has very small values (10^-5), but sometimes the y coordinate is much higher (0.1 - 0.5). Parameters are the same like here: link
Moreover the car rolls over while turning.
The ground is BoxShape and the collisions with wheels and the car body are correct.

7
Support / jPCT-AE + JBullet vehicle
« on: December 30, 2012, 03:46:34 am »
I'm looking for any examples of vehicle's physics supported by JBullet with jPCT-AE. I've tried to connect these libraries all day based on VehicleDemo from JBullet and jPCT wiki and.... The problem is that the program doesn't discover collision between wheels and ground, steering doesn't work at all. I have any idea how to combine it. I would be very pleased if someone helped me.

Iblis

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