... shader ice - conversion godot 3.x to godot 4.3 dev 5

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Godot Version

v4.3.dev5.official [89f70e98d]

Question

I want to convert this old godot 3.x shader to Godot 4.3 dev shader .
I tried some new changes like MODEL_MATRIX , but the result is not the same:

This is the source code:

shader_type spatial;

//WORLD_MATRIX rename to MODEL_MATRIX
//WORLD_NORMAL_MATRIX rename to MODEL_NORMAL_MATRIX
//
//CAMERA_MATRIX rename to INV_VIEW_MATRIX
//INV_CAMERA_MATRIX rename to VIEW_MATRIX

uniform sampler2D over_texture : hint_depth_texture;
uniform sampler2D under_texture : hint_depth_texture;
uniform sampler2D surface_normalmap : hint_normal;

uniform vec4 top_color : source_color = vec4(0.6764, 0.980092, 1.0, 1.0);
uniform float depth = 0.1;
uniform float normal_depth = 1.0;
uniform float roughness : hint_range(0.0, 1.0) = 0.0;
uniform float metallic : hint_range(0.0, 1.0) = 0.7;
uniform float refractive_index = 0.1;

float blend_over(float base, float blend) {
	float branchless = step (base,0.5);
	return (2.0*base*blend)*branchless + (1.0-2.0*(1.0-base)*(1.0-blend))*(1.0-branchless); //This is branchless version
}

vec3 blendOverlay(vec3 base, vec3 blend) {
	return vec3(blend_over(base.r,blend.r),blend_over(base.g,blend.g),blend_over(base.b,blend.b));
}

varying vec3 ro;
varying vec3 p;
varying vec3 vertex_normal_ws;
void vertex()
{
	ro = (CAMERA_POSITION_WORLD * vec3(0.0, 0.0, 1.0));// Get camera position in World space coordinates
	p = ((WORLD_MATRIX)*vec4(VERTEX,1.0)).xyz;// Get fragment position in world space coordinates
	vertex_normal_ws = ((WORLD_MATRIX)*vec4(NORMAL,1.0)).xyz;
}

void fragment(){
	vec3 normal = texture(surface_normalmap, UV).xyz * 2.0 - 1.0;
	NORMALMAP = texture(surface_normalmap, UV).xyz;
	NORMALMAP_DEPTH = normal_depth;

	vec3 refraction;
	vec3 rd = normalize(p - ro - normal * refractive_index) * depth;

	vec3 over_color = texture(over_texture, UV).rgb;
	vec3 color = blendOverlay(over_color, top_color.rgb);
	vec2 offset = rd.xz;
	vec3 under_color = texture(under_texture, UV + offset + (normal.xy)).rgb;
	ALBEDO = blendOverlay(color, under_color);
	ROUGHNESS = roughness;
	METALLIC = metallic;
}