THREE.js Geometry map does not appear - javascript

Following I'm loading a image map on a custom geometry,
it represents the brown colored geometry on the picture above:
var aqua_ground_geo = new THREE.Geometry();
var top0 = new THREE.Vector3(aqua_ground_geo_x_NEG, user_data['aqua_soil_calc_b_y'], aqua_ground_geo_z_NEG);
var top1 = new THREE.Vector3(aqua_ground_geo_x_POS, user_data['aqua_soil_calc_b_y'], aqua_ground_geo_z_NEG);
var top2 = new THREE.Vector3(aqua_ground_geo_x_NEG, user_data['aqua_soil_calc_f_y'], aqua_ground_geo_z_POS);
aqua_ground_geo.vertices.push(top0);
aqua_ground_geo.vertices.push(top1);
aqua_ground_geo.vertices.push(top2);
aqua_ground_geo.faces.push( new THREE.Face3(0,1,2) );
aqua_ground_geo.computeFaceNormals();
aqua_ground_geo.computeVertexNormals();
var textureUrl = "http://www.lifeguider.de/wp-content/uploads/aquag/bodengrund/dennerle_kies_naturweiss_1-2mm.jpg";
var aqua_bodengrund_tex = new THREE.TextureLoader().load( textureUrl );
var aqua_bodengrund_mat = new THREE.MeshLambertMaterial( {
map: aqua_bodengrund_tex,
color: 0xffffff,
} );
aqua_bodengrund_mat.shading = THREE.FlatShading;
aqua_bodengrund_mat.side = THREE.DoubleSide;
var aqua_bodengrund = new THREE.Mesh( aqua_ground_geo,aqua_bodengrund_mat);
On a simple THREE.BoxGeometry all works as expected with the same material (it represents the cube in the picture above):
var lala = new THREE.BoxGeometry( 100, 100, 100 );
var lala2 = new THREE.Mesh( lala,aqua_bodengrund_mat);
I'm not an expert in 3D, what is missing in my code that the image texture will be shown correctly?


You need to apply the texture in the callback of the THREE.TextureLoader. Check also the documentation here; the second argument (onLoad) is the callback.
var textureUrl = "https://raw.githubusercontent.com/mrdoob/three.js/master/examples/textures/crate.gif";
var aqua_bodengrund_mat = new THREE.MeshLambertMaterial( {
color: 0xffffff
});
var onLoad = function( texture ){
aqua_bodengrund_mat.map = texture;
aqua_bodengrund_mat.needsUpdate = true;
}
var loader = new THREE.TextureLoader();
loader.load( textureUrl, onLoad );
See this fiddle for a demo.
UPDATE
In case you have a custom geometry you also need to calculate the UVs for showing the texture correctly. I used this answer here to calculate them in another fiddle here
Note. The UVs in my fiddle are calculated for faces in the XY plane, if your faces are in another plane you will have to update accordingly...

Related

Three.js - PlaneGeometry from Math.Plane

I am trying to draw a least squares plane through a set of points in Three.js. I have a plane defined as follows:
var plane = new THREE.Plane();
plane.setFromNormalAndCoplanarPoint(normal, point).normalize();
My understanding is that I need to take that plane and use it to come up with a Geometry in order to create a mesh to add to the scene for display:
var dispPlane = new THREE.Mesh(planeGeometry, planeMaterial);
scene.add(dispPlane);
I've been trying to apply this answer to get the geometry. This is what I came up with:
plane.setFromNormalAndCoplanarPoint(dir, centroid).normalize();
planeGeometry.vertices.push(plane.normal);
planeGeometry.vertices.push(plane.orthoPoint(plane.normal));
planeGeometry.vertices.push(plane.orthoPoint(planeGeometry.vertices[1]));
planeGeometry.faces.push(new THREE.Face3(0, 1, 2));
planeGeometry.computeFaceNormals();
planeGeometry.computeVertexNormals();
But the plane is not displayed at all, and there are no errors to indicate where I may have gone wrong.
So my question is, how can I take my Math.Plane object and use that as a geometry for a mesh?

This approach should create a mesh visualization of the plane. I'm not sure how applicable this would be towards the least-squares fitting however.
// Create plane
var dir = new THREE.Vector3(0,1,0);
var centroid = new THREE.Vector3(0,200,0);
var plane = new THREE.Plane();
plane.setFromNormalAndCoplanarPoint(dir, centroid).normalize();
// Create a basic rectangle geometry
var planeGeometry = new THREE.PlaneGeometry(100, 100);
// Align the geometry to the plane
var coplanarPoint = plane.coplanarPoint();
var focalPoint = new THREE.Vector3().copy(coplanarPoint).add(plane.normal);
planeGeometry.lookAt(focalPoint);
planeGeometry.translate(coplanarPoint.x, coplanarPoint.y, coplanarPoint.z);
// Create mesh with the geometry
var planeMaterial = new THREE.MeshLambertMaterial({color: 0xffff00, side: THREE.DoubleSide});
var dispPlane = new THREE.Mesh(planeGeometry, planeMaterial);
scene.add(dispPlane);

var material = ...;
var plane = new THREE.Plane(...);
// Align to plane
var geometry = new THREE.PlaneGeometry(100, 100);
var mesh = new THREE.Mesh(geometry, material);
mesh.translate(plane.coplanarPoint());
mesh.quaternion.setFromUnitVectors(new THREE.Vector3(0,0,1), plane.normal);
Note that Plane.coplanarPoint() simply returns -normal*constant, so it might be a better option to use Plane.projectPoint() to determine a center that is "close to" an arbitrary point.

How to add texture to object in three.js?

I am trying to add to texture to my central sphere (the earth) but when I try the object disappears. Can I have some guide to where I am going wrong. Thanks
Here is the link to my jsbin http://jsbin.com/cabape/edit?html,output . I am going to get the moon to rotate around the earth
//earth
var loader = new THREE.TextureLoader();
loader.load( 'http://simpletruthsforhealthyliving.com/js/earth.jpg', function ( texture ) {
var center = new THREE.SphereGeometry(20,20,20);
var materialShereCenter = new THREE.MeshPhongMaterial( { ambient: 0xee0011, color:0xff0000, specular: 0xee0000, shininess: 70,wireframe: false, map: texture } );
centralSphere = new THREE.Mesh(center, materialShereCenter);
centralSphere.position.z = 0;
centralSphere.position.x = 0;
centralSphere.position.y = 0;
scene.add(centralSphere);
});

This needed to be added as well
var texture = new THREE.Texture();
var loader = new THREE.ImageLoader();
loader.addEventListener( 'load', function ( event ) {
Texture1.image = event.content;
Texture1.needsUpdate = true;
} );
loader.load( 'http://simpletruthsforhealthyliving.com/js/earth.jpg' );

Threejs BufferGeometry - Render some faces with other Texture

i have an output date like this:
geom[0] = {
texturesindexT: new Int16Array([0,1,2,3]),
texturesindexS: new Int16Array([-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,...]),
materialsindexT: new Int16Array([-1,-1,-1,-1]),
materialsindexS: new Int16Array([-1,0,1,2,3,4,5,0,6,2,7,8,-1,0,...]),
startIndicesT: new Uint32Array([0,288,606,897,1380]),
startIndicesS: new Uint32Array([1380,1431,1479,1485,1497,1515,1659,...]),
m_indices: new Uint16Array([0,1,2,3,0,2,4,2,5,4,6,2,7,3,2,8,9,10,...]),
m_vertices: new Float32Array([-81.93996,25.7185,-85.53822,-81.93996,...]),
m_normals: new Float32Array([-0.004215205,0.9999894,-0.001817489,-0.004215205,...]),
m_texCoords: new Float32Array([0,0.04391319,0,0.2671326,0.009521127,0.03514284,...]),
}
var textures = new Array("-1_-1/t0.jpg","-1_-1/t1.jpg","-1_-1/t2.jpg",...);
The Data is in order for an Index, Vertex and Normal-Buffer but sections have to be rendered with other Textures and Maretials.
I have tried to make a THREE.Geometry out of the indices, vertices and texCoords/UVCoords but that didn't work.
Now i am trying use a THREE.BufferGeometry() and this work BUT i need to render index 0 to 287 with Texture "textures[0]" and index 288 to 605 with "textures[1]" and so on.
My first attempt was to make a BufferGeometry for each part with index 288 to 605 , but since the Indices are in order for the hole model, i have to put the complete vertices, normales and UVCoords in the Buffer for just a couple of faces.
Is there a way to render sections of the BufferGeometry with other Textures or to set the Texture Index for each Face?
Or is it possible to create a Material, that renders the first X faces with Texture A and the next with Texture B???

If you want to use two different textures with a single BufferGeometry, you can use this pattern, which sets drawcalls:
var geometry1 = new THREE.BufferGeometry();
// ...and set the data...
var geometry2 = geometry1.clone();
// set drawcalls
geometry1.offsets = geometry1.drawcalls = []; // currently required
geometry1.addDrawCall( start1, count1, 0 );
geometry2.offsets = geometry2.drawcalls = []; // currently required
geometry2.addDrawCall( start2, count2, 0 );
var material1 = new THREE.MeshPhongMaterial( { map: map1 } );
var material2 = new THREE.MeshPhongMaterial( { map: map2 } );
var mesh1 = new THREE.Mesh( geometry1, material1 );
var mesh2 = new THREE.Mesh( geometry2, material2 );
three.js r.70

You can create two geometries with same vertex buffers and different indexes:
var position = new THREE.BufferAttribute(positionArray, 3);
var normal = new THREE.BufferAttribute(normalArray, 3);
var uv = new THREE.BufferAttribute(uvArray, 2);
var indices1 = new THREE.BufferAttribute(indexArray1, 1);
var geometry1 = new THREE.BufferGeometry();
geometry1.addAttribute('position', position);
geometry1.addAttribute('normal', normal);
geometry1.addAttribute('uv', uv);
geometry1.addAttribute('index', indices1);
var indices2 = new THREE.BufferAttribute(indexArray2, 1);
var geometry2 = new THREE.BufferGeometry();
geometry2.addAttribute('position', position);
geometry2.addAttribute('normal', normal);
geometry2.addAttribute('uv', uv);
geometry2.addAttribute('index', indices2);
and then create 2 meshes with different materials as you normally would. As far as I understand, this will re-use same data in both meshes.

comparing methods of creating skybox material in three.js

When it comes to making skyboxes in three.js, I have seen two different schools of thought. Assuming that we have the code
var imagePrefix = "images/mountains-";
var directions = ["xpos", "xneg", "ypos", "yneg", "zpos", "zneg"];
var imageSuffix = ".jpg";
var skyGeometry = new THREE.CubeGeometry( 10000, 10000, 10000 );
In both methods, one creates a really big cube and applies textures. The difference is whether shaders are used. For example:
Material without using shader:
var materialArray = [];
for (var i = 0; i < 6; i++)
materialArray.push( new THREE.MeshBasicMaterial({
map: THREE.ImageUtils.loadTexture( imagePrefix + directions[i] + imageSuffix ),
side: THREE.BackSide
}));
var skyMaterial = new THREE.MeshFaceMaterial( materialArray );
var skyBox = new THREE.Mesh( skyGeometry, skyMaterial );
scene.add( skyBox );
Material using shader:
var imageURLs = [];
for (var i = 0; i < 6; i++)
imageURLs.push( imagePrefix + directions[i] + imageSuffix );
var textureCube = THREE.ImageUtils.loadTextureCube( imageURLs );
var shader = THREE.ShaderLib[ "cube" ];
shader.uniforms[ "tCube" ].value = textureCube;
var skyMaterial = new THREE.ShaderMaterial( {
fragmentShader: shader.fragmentShader,
vertexShader: shader.vertexShader,
uniforms: shader.uniforms,
depthWrite: false,
side: THREE.BackSide
} );
var skyBox = new THREE.Mesh( skyGeometry, skyMaterial );
scene.add( skyBox );
My own informal performance tests show no significant difference in FPS using 2048x2048 images for textures. The shader-free code is easier (at least for me) to understand. Are there situations in which there is an advantage to using the shader-based texture?

You have a conceptual misunderstanding.
For WebGL, both methods involve shaders. MeshBasicMaterial has a vertex and fragment shader that has been written for you for convenience.
The primary difference between the two examples is the second example uses a cube map for input.
You would use that approach if you were already using the same cube map as an environment map in a reflective material, for example.
The first example is just another way to render a skybox, and is the only one of the two that will work with CanvasRenderer.
three.js r.58

Verification of using multiple textures with three.js cubes

Can someone please verify the following code for three.js r53?
It's taken from this question: How to use multiple materials in a Three.js cube?
I tried this code and a few variations but I don't get visible cubes. My texture images are named as they should be.
var materials = [];
for (var i=0; i<6; i++) {
var img = new Image();
img.src = i + '.png';
var tex = new THREE.Texture(img);
img.tex = tex;
img.onload = function() {
this.tex.needsUpdate = true;
};
var mat = new THREE.MeshBasicMaterial({color: 0xffffff, map: tex});
materials.push(mat);
}
var cubeGeo = new THREE.CubeGeometry(400, 400, 400, 1, 1, 1, materials);
var cube = new THREE.Mesh(cubeGeo, new THREE.MeshFaceMaterial());

Do this instead:
var cubeGeo = new THREE.BoxGeometry( 400, 400, 400, 1, 1, 1 );
var cube = new THREE.Mesh( cubeGeo, materials );
materials is an array of 6 three.js materials, one for each face.
See the Migration Guide: https://github.com/mrdoob/three.js/wiki/Migration-Guide.
EDIT: CubeGeometry has been renamed to BoxGeometry and THREE.MeshFaceMaterial has been deprecated.
three.js r.92

THREE.CubeGeometry() doesn't support a list of materials. I thought it did too, but if you check the current source code.... it doesn't

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