In Stride we can create our own Procedural Models's like in this example
I think it might be a good idea to add a page about custom primitives. Maybe here or as a separate page?
using Stride.Assets.Models;
using Stride.Core;
using Stride.Core.Assets;
using Stride.Core.Mathematics;
using Stride.Graphics;
using Stride.Rendering.ProceduralModels;
using System;
[DataContract("PrismModel")]
[Display("Prism")]
public class Prism : PrimitiveProceduralModelBase
{
public float Height { get; set; } = 1f;
protected override GeometricMeshData<VertexPositionNormalTexture> CreatePrimitiveMeshData()
{
float h = MathF.Sqrt(3f) / 2f;
float halfH = Height / 2f;
// Front face (z = -halfH)
Vector3 p0 = new(-0.5f, -h / 3f, -halfH);
Vector3 p1 = new( 0.5f, -h / 3f, -halfH);
Vector3 p2 = new( 0.0f, 2f * h / 3f, -halfH);
// Back face (z = +halfH)
Vector3 p3 = new(-0.5f, -h / 3f, halfH);
Vector3 p4 = new( 0.5f, -h / 3f, halfH);
Vector3 p5 = new( 0.0f, 2f * h / 3f, halfH);
// 2 triangles × 3 + 3 quads × 6 = 6 + 18 = 24 vertices
VertexPositionNormalTexture[] vertices = new VertexPositionNormalTexture[24];
int[] indices = new int[24];
int v = 0;
int i = 0;
void AddTriangle(Vector3 a, Vector3 b, Vector3 c)
{
var n = Vector3.Normalize(Vector3.Cross(b - a, c - a));
vertices[v + 0] = new(a, n, new Vector2(0, 1));
vertices[v + 1] = new(b, n, new Vector2(1, 1));
vertices[v + 2] = new(c, n, new Vector2(0.5f, 0));
indices[i++] = v; indices[i++] = v+1; indices[i++] = v+2;
v += 3;
}
void AddQuad(Vector3 a, Vector3 b, Vector3 c, Vector3 d)
{
var n = Vector3.Normalize(Vector3.Cross(b - a, c - a));
vertices[v + 0] = new(a, n, new Vector2(0, 0));
vertices[v + 1] = new(b, n, new Vector2(1, 0));
vertices[v + 2] = new(c, n, new Vector2(1, 1));
vertices[v + 3] = new(d, n, new Vector2(0, 1));
indices[i++] = v; indices[i++] = v+1; indices[i++] = v+2;
indices[i++] = v+2; indices[i++] = v+3; indices[i++] = v;
v += 4;
}
// Front face — normal points toward -Z (CCW when viewed from the front)
AddTriangle(p0, p1, p2);
// Back face — normal points toward +Z (CW when viewed from the front = CCW when viewed from the back)
AddTriangle(p3, p5, p4);
// Side faces (CCW from outside)
AddQuad(p0, p3, p4, p1); // bottom
AddQuad(p1, p4, p5, p2); // right
AddQuad(p2, p5, p3, p0); // left
return new GeometricMeshData<VertexPositionNormalTexture>(vertices, indices, isLeftHanded: false)
{
Name = "Prism"
};
}
}Then we can select in the procedural model type
And for asset of this model we can create our Prism asset like in custom asset manual. In that case, the .sdtpl template would look like this:
!TemplateAssetFactory
Id: A1B2C3D4-E5F6-7890-ABCD-EF1234567890
AssetTypeName: ProceduralModelAsset
Name: Prism
Scope: Asset
Description: A triangular prism procedural model asset
Group: Model
Order: 25
DefaultOutputName: Prism
FactoryTypeName: ProceduralModelPrismFactory
add factory to procedural model file:
....
//code of Prism class
return new GeometricMeshData<VertexPositionNormalTexture>(vertices, indices, isLeftHanded: false)
{
Name = "Prism"
};
}
}
public class ProceduralModelPrismFactory : AssetFactory<ProceduralModelAsset>
{
public override ProceduralModelAsset New()
{
return new ProceduralModelAsset
{
Type = new Prism
{
Height = 1f
}
};
}
}
And our model is available in Assets
In Stride we can create our own
Procedural Models's like in this exampleI think it might be a good idea to add a page about custom primitives. Maybe here or as a separate page?
Then we can select in the procedural model type
And for asset of this model we can create our Prism asset like in custom asset manual. In that case, the
.sdtpltemplate would look like this:add factory to procedural model file:
And our model is available in Assets