How to cut a 3d object

Hello everyone, I’m new to urho.
Could anyone pls help me with question about how to clipping a 3d object, I just want to do the same like here by urho.

Hello, and welcome to the forum!

There have been a number of CSG-related threads that may be helpful.
https://discourse.urho3d.io/search?q=CSG

Thanks a lot, but is there any easy solution?
I just want let a model which assigned material disappear slowly from left to right.

…now I think a better approach could be material-based, like heXon used; discussion and shaders:

Thanks your quick answer, is there any more easy way?
In three.js just set a clipping plan for material is enough:sweat_smile:
I do some research on urho, it just can set the clipping plane in camera.
could we do it by set animation or mask ?

I’m new to urho3d, want to make a effect about box disappear from top to buttom slowly.
After do some research I find that need to implement it by custom shader. I known how to do it by Unity3d, like below, but have no idea in Urho3d’s shader. especially how to clip in the ps() method.
Pass
{
CGPROGRAM
#pragma vertex vert
#pragma fragment frag

        #include "UnityCG.cginc"

        struct appdata
        {
            float4 vertex : POSITION;
            float2 uv : TEXCOORD0;

        };

        struct v2f
        {
            float3 uv : TEXCOORD0;

            float4 vertex : SV_POSITION;
        };

        sampler2D _MainTex;
        float4 _MainTex_ST;
        float _DisappearOffset;

        v2f vert (appdata v)
        {
            v2f o;
            o.vertex = UnityObjectToClipPos(v.vertex);
            o.uv.xy = TRANSFORM_TEX(v.uv, _MainTex);
            o.uv.z = _DisappearOffset - v.vertex.y;
            return o;
        }

        xed4 frag (v2f i) : SV_Target
        {
            clip(i.uv.z);
            fixed4 col = tex2D(_MainTex, i.uv.xy);
            return col;
        }
        ENDCG
    }

Basically it’s GLSL/HLSL… Pages on Shaders, Rendering, etc. at Related pages go into detail.
Dunno if Modanung’s shader is worth a look for this…

*or maybe a graphics programming Q&A site …

1vanK created the dissolve shader, if that’s the shader you mean.

My first try for this would be to set alpha to 0 when y > 0 in the fragment shader.