generated mesh bug?

Armory Engine General
1

In the generate mesh example, the generated polygons disappear when moving through the scene at a certain angle. I do not know if it is a bug or an error in the code or in the specification of the elements of the geometry. I have made a test with my own code using two polygons to form a plane and the same occurs.

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2

give your file .blender

3

Sorry, the forum does not allow me to upload files. Anyway, the blend file that is used in the first example of the images is that of the script_genmesh tutorial. In mine I do not think it contains much, since the geometry is generated dynamically, but I include the code that I used.

package arm;

import iron.Scene;
import iron.data.SceneFormat;
import iron.data.Data;
import iron.data.MeshData;
import iron.data.MaterialData;
import iron.system.Input;

@:keep
class MyTrait extends iron.Trait {

var meshData:MeshData;
var materials:haxe.ds.Vector<MaterialData>;

function toF32(ar:Array<Float>):kha.arrays.Float32Array {
	var vals = new kha.arrays.Float32Array(ar.length);
	for (i in 0...vals.length) vals[i] = ar[i];
	return vals;
}

function toU32(ar:Array<Int>):kha.arrays.Uint32Array {
	var vals = new kha.arrays.Uint32Array(ar.length);
	for (i in 0...vals.length) vals[i] = ar[i];
	return vals;
}

function map(){
	for (i in 0...10){
		for (j in 0...10){
			// Create new object in active scene
			var object = Scene.active.addMeshObject(meshData, materials);
			
			// Just for testing, add rigid body trait
			var aabb = meshData.geom.aabb;
			object.transform.loc.set(-8 + j, -8 + i, 0);
			object.transform.buildMatrix();
			object.transform.dim.set(aabb.x, aabb.y, aabb.z);
			object.addTrait(new armory.trait.physics.RigidBody());
		}
	}
}
	

public function new() {
	super();

	var pos:TVertexArray = {
		attrib: "pos",
		size: 3,
		values: toF32([0.0,0.0,0.0,
					   1.0,0.0,0.0,
					   0.0,1.0,0.0,
					   1.0,1.0,0.0])
	};

	var nor:TVertexArray = {
		attrib: "nor",
		size: 3,
		values: toF32([0.0,0.0,1.0,
					   0.0,0.0,1.0,
					   0.0,0.0,1.0,
					   0.0,0.0,1.0])
	};

	var indices:TIndexArray = {
		material: 0,
		values: toU32([0,1,2,1,3,2])
	};

	var rawmeshData:TMeshData = { 
		name: "BoxMesh",
		vertex_arrays: [pos, nor],
		index_arrays: [indices]
	};

	new MeshData(rawmeshData, function(data:MeshData) {
		// Mesh data parsed
		meshData = data;
		meshData.geom.calculateAABB();
		
		// Fetch material from scene data
		Data.getMaterial("Scene", "Material", function(data:MaterialData) {
			// Material loaded
			materials = haxe.ds.Vector.fromData([data]);
			notifyOnUpdate(update);
		});
	});
	
	map();
}

}

4

It was a bug with frustum culling, should be now fixed in git armory. :slight_smile:

5

Ok. Thanks for your quick response.