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Motero
02-24-2012, 11:01 AM
Hello folks,

i need your help

I got a cube rotating on a white bakground.
I would like to see the cube rotating on a transparent background.

I googled a lot but something is still wrong.

Here is the code


var xSpeed = 0, ySpeed = 0;

function Move(SpeedX, SpeedY)
{
xSpeed = SpeedX;
ySpeed = SpeedY;
}

function webGLStart() {
var xRot = 0,
yRot = 0,
z = -5.0,
filter = 0,
filters = ['nearest', 'linear', 'mipmap'];

//Create object
var cube = new PhiloGL.O3D.Model({
vertices: [-1, -1, 1,
1, -1, 1,
1, 1, 1,
-1, 1, 1,

-1, -1, -1,
-1, 1, -1,
1, 1, -1,
1, -1, -1,

-1, 1, -1,
-1, 1, 1,
1, 1, 1,
1, 1, -1,

-1, -1, -1,
1, -1, -1,
1, -1, 1,
-1, -1, 1,

1, -1, -1,
1, 1, -1,
1, 1, 1,
1, -1, 1,

-1, -1, -1,
-1, -1, 1,
-1, 1, 1,
-1, 1, -1],

texCoords: [
// Front face
0.0, 0.0,
1.0, 0.0,
1.0, 1.0,
0.0, 1.0,

// Back face
1.0, 0.0,
1.0, 1.0,
0.0, 1.0,
0.0, 0.0,

// Top face
0.0, 1.0,
0.0, 0.0,
1.0, 0.0,
1.0, 1.0,

// Bottom face
1.0, 1.0,
0.0, 1.0,
0.0, 0.0,
1.0, 0.0,

// Right face
1.0, 0.0,
1.0, 1.0,
0.0, 1.0,
0.0, 0.0,

// Left face
0.0, 0.0,
1.0, 0.0,
1.0, 1.0,
0.0, 1.0
],

indices: [0, 1, 2, 0, 2, 3,
4, 5, 6, 4, 6, 7,
8, 9, 10, 8, 10, 11,
12, 13, 14, 12, 14, 15,
16, 17, 18, 16, 18, 19,
20, 21, 22, 20, 22, 23]
});

PhiloGL('lesson06-canvas', {
program: {
from: 'ids',
vs: 'shader-vs',
fs: 'shader-fs'
},
events: {
onKeyDown: function(e) {
switch(e.key) {
case 'f':
filter = (filter + 1) % 3;
break;
case 'up':
xSpeed -= 0.02;
break;
case 'down':
xSpeed += 0.02;
break;
case 'left':
ySpeed -= 0.02;
break;
case 'right':
ySpeed += 0.02;
break;
//handle page up/down
default:
if (e.code == 33) {
z -= 0.05;
} else if (e.code == 34) {
z += 0.05;
}
}
}
},
onError: function() {
alert("An error ocurred while loading the application");
},
onLoad: function(app) {
var gl = app.gl,
canvas = app.canvas,
program = app.program,
camera = app.camera,
view = new PhiloGL.Mat4,
rCube = 0;

gl.viewport(0, 0, canvas.width, canvas.height);
gl.clearColor(255, 255, 255, 0);
gl.clearDepth(1);
gl.enable(gl.DEPTH_TEST);
gl.depthFunc(gl.LEQUAL);

camera.view.id();

//set buffers with cube data
program.setBuffers({
'aVertexPosition': {
value: cube.vertices,
size: 3
},
'aTextureCoord': {
value: cube.texCoords,
size: 2
},
'indices': {
value: cube.indices,
bufferType: gl.ELEMENT_ARRAY_BUFFER,
size: 1
}
});

//load textures from image
var img = new Image();
img.onload = function() {
program.setTextures({
'nearest': {
data: {
value: img
}
},

'linear': {
data: {
value: img
},
parameters: [{
name: gl.TEXTURE_MAG_FILTER,
value: gl.LINEAR
}, {
name: gl.TEXTURE_MIN_FILTER,
value: gl.LINEAR
}]
},

'mipmap': {
data: {
value: img
},
parameters: [{
name: gl.TEXTURE_MAG_FILTER,
value: gl.LINEAR
}, {
name: gl.TEXTURE_MIN_FILTER,
value: gl.LINEAR_MIPMAP_NEAREST,
generateMipmap: true
}]
}
});

function animate() {
xRot += xSpeed;
yRot += ySpeed;
}

function tick() {
drawScene();
animate();
PhiloGL.Fx.requestAnimationFrame(tick);
}

function drawScene() {
gl.clearColor(255, 255, 255, 0);
gl.clear(gl.COLOR_BUFFER_BIT);
//draw Cube
cube.position.set(0, 0, z);
cube.rotation.set(xRot, yRot, 0);
//update element matrix
cube.update();
//get new view matrix out of element and camera matrices
view.mulMat42(camera.view, cube.matrix);
//set attributes, indices and textures
program.setBuffer('aVertexPosition')
.setBuffer('aTextureCoord')
.setBuffer('indices')
.setTexture(filters[filter]);
//set uniforms
program.setUniform('uMVMatrix', view)
.setUniform('uPMatrix', camera.projection)
.setUniform('uSampler', 0);
//draw triangles
gl.drawElements(gl.TRIANGLES, cube.indices.length, gl.UNSIGNED_SHORT, 0);
}
tick();
};
//load image
img.src = 'images/crate.jpg';
}
});
}

http://s1.directupload.net/images/120224/drb83req.jpg


Can someone help me??

Sergejack
03-02-2012, 06:44 AM
What web browsers did you run your demo on?