2nafish117 / godot-viewmodel-render-test

tiny project to test out an idea i had to render fov independent viewmodels

godot-viewmodel-render-test

Demo project to test out viewmodel rendering in godot.

I want this

Copy these uniforms to where your uniforms are.

const float PI = 3.1415926;

uniform float viewmodel_fov = 50.0f;

Copy this at the end of your vertex shader

float onetanfov = 1.0f / tan(0.5f * (viewmodel_fov * PI / 180.0f));
float aspect = VIEWPORT_SIZE.x / VIEWPORT_SIZE.y;
// modify projection matrix
PROJECTION_MATRIX[1][1] = onetanfov;
PROJECTION_MATRIX[0][0] = onetanfov / aspect;

// draws the viewmodel over everything (disable if you want dof near on viewmodel)
POSITION = PROJECTION_MATRIX * MODELVIEW_MATRIX * vec4(VERTEX.xyz, 1.0);
POSITION.z = mix(POSITION.z, 0, 0.99);

See /Assets/Viewmodel.gdshader for the complete shader code.

How it works

The viewmodel shader modifies its projection matrix to render the viewmodel at a different fov than the main camera.

camera fov 40 and viewmodel fov 60 camera fov 90 and viewmodel fov 60 money shot with dof doesnt clip into nearby geometry