Question How to set point size of vertex in shader?

I'm trying to put pointcloud into scene, but the cloud is sparse. PSIZE looks like not be supported by Unity, is there anyway to set point size, or other way to draw the cloud?

Here's the code I use and the result:

Code (CSharp):

1. // Upgrade NOTE: replaced 'mul(UNITY_MATRIX_MVP,*)' with 'UnityObjectToClipPos(*)'
2.  
3. Shader "Custom/VertexColor" {
4.     SubShader {
5.     Pass {
6.         LOD 200
7.  
8.  
9.         CGPROGRAM
10.         #pragma vertex vert
11.         #pragma fragment frag
12.  
13.         uniform float _PointSize = 5;
14.  
15.         struct VertexInput {
16.             float4 v : POSITION;
17.             float4 color: COLOR;
18.         };
19.        
20.         struct VertexOutput {
21.             float4 pos : SV_POSITION;
22.             float4 col : COLOR;
23.             float size: PSIZE;
24.         };
25.        
26.         VertexOutput vert(VertexInput v) {
27.        
28.             VertexOutput o;
29.             o.pos = UnityObjectToClipPos(v.v);
30.             o.col = v.color;
31.             o.size = 3;
32.            
33.             return o;
34.         }
35.        
36.         float4 frag(VertexOutput o) : COLOR {
37.             return o.col;
38.         }
39.         ENDCG
40.         }
41.     }
42. }

 

I don’t think this is a Unity limitation. Modern GPUs & Graphics APIs don’t support PSIZE anymore. Point rendering this way is considered a dead technique, so new Graphics APIs stopped actually supporting it a over decade ago, and most GPUs phased out support of it after that.

The modern approach would be to use indirect instancing to draw meshes.

 

works still with -force-glcore mode in Windows though (and macs, androids)

 

On some GPUs, not all.