Godot Version
4.5.dev
Question
Hello, I’m working on a dissolving shader for dying ennemies, to do so I created a value uniform float dying_t : hint_range(0.0, 2.0, 0.01) = 2.0;, but for some reason it’s value always seems to reset to 1.0, I looked at everything and couldn’t manage to find a solution 
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Here’s the gdshader code :
StandardMaterial3D.
shader_type spatial;
render_mode blend_mix, depth_draw_opaque, cull_back, diffuse_burley, specular_schlick_ggx;
uniform vec4 albedo : source_color;
uniform sampler2D texture_albedo : source_color, filter_linear_mipmap, repeat_enable;
uniform ivec2 albedo_texture_size;
uniform float point_size : hint_range(0.1, 128.0, 0.1);
uniform float roughness : hint_range(0.0, 1.0);
uniform sampler2D texture_metallic : hint_default_white, filter_linear_mipmap, repeat_enable;
uniform vec4 metallic_texture_channel;
uniform sampler2D texture_roughness : hint_roughness_r, filter_linear_mipmap, repeat_enable;
uniform sampler2D noise_death;
uniform float specular : hint_range(0.0, 1.0, 0.01);
uniform float metallic : hint_range(0.0, 1.0, 0.01);
uniform float dying_t : hint_range(0.0, 2.0, 0.01) = 2.0;
uniform vec3 uv1_scale;
uniform vec3 uv1_offset;
uniform vec3 uv2_scale;
uniform vec3 uv2_offset;
void vertex() {
UV = (VERTEX.xy + vec2(1.0)) * 0.5; // map XYZ to UV range [0,1]
//UV = UV * uv1_scale.xy + uv1_offset.xy;
}
void fragment() {
vec2 base_uv = UV;
vec4 albedo_tex = texture(texture_albedo, base_uv);
ALBEDO = albedo.rgb * albedo_tex.rgb;
float metallic_tex = dot(texture(texture_metallic, base_uv), metallic_texture_channel);
METALLIC = metallic_tex * metallic;
SPECULAR = specular;
vec4 roughness_texture_channel = vec4(1.0, 0.0, 0.0, 0.0);
float roughness_tex = dot(texture(texture_roughness, base_uv), roughness_texture_channel);
ROUGHNESS = roughness_tex * roughness;
vec4 alpha_tex = texture(noise_death, base_uv);
ALPHA = round(dying_t - alpha_tex.x);// <===== used here
if(ALPHA > 1.0)
{
ALPHA = 1.0;
}
if(ALPHA < 0.0)
{
ALPHA = 0.0;
}
}
I created a dedicated enemy_shader.tres ShaderMaterial and applied it the dedicated enemy_shader.gdshader, and in the Shader Parameters I setup the Dying T variable to “2.0”.
Then, after doing this I applied it to my “Enemy.tscn”.
On side of that I also have those lines in this scene main script :
func _ready():
var mat = $Body.mesh.surface_get_material(0).duplicate()
$Body.mesh.set_material(mat)
mat.set_shader_parameter("dying_t", 2.0)
I use this because my instances shared the same shader and when one was dying everyone would dissolves 
, there’s also a workaround for my current issue but my question goal is just to understand why such a thing would happen.
When I instanciate my “Enemy.tscn” I then launch the debug (and remove the above solution) and am met with this :
Thus showing that my Dying T variable is at 1.0 despite everything.
I also use this value in an animation player for death animation and it work well :
Would someone happen to know something about it ? I tried to look for this everywhere but never found an answer.
Sorry for the huge post, have a nice day 
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