I have been able to solve this problem. in the \assets\custom\shaders\core folder make a FSH file and name it rendertype_armor_cutout_no_cull. If the opacity is set to 253 the texture will pulse.



paste the following into the file:



#version 150

#moj_import <fog.glsl>

uniform sampler2D Sampler0;

uniform vec4 ColorModulator;
uniform float FogStart;
uniform float FogEnd;
uniform float GameTime;
uniform vec4 FogColor;

in float vertexDistance;
in vec4 vertexColor;
in vec2 texCoord0;
in vec2 texCoord1;
in vec4 normal;

out vec4 fragColor;

void main() {
vec4 color = texture(Sampler0, texCoord0) * vertexColor * ColorModulator;
if (color.a < 0.1) {discard;}

float TrimAnimation = GameTime * 1000;
float opacity = ceil(color.a * 255);

if (opacity == 253) {color = mix(
color,
mix( texture(Sampler0,texCoord0)/2 , texture(Sampler0,texCoord0)*2 , pow(sin(min(vertexDistance,20)),2) ), pow(sin(TrimAnimation),2)
);};
if (opacity == 254) {color = color + (texture(Sampler0, texCoord0) * 0.75);};
if (opacity == 252) {color = color + (texture(Sampler0, texCoord0) * 0.25);};
if (opacity == 251) {color = color + (texture(Sampler0, texCoord0) * 0.125);}

fragColor = linear_fog(color, vertexDistance, FogStart, FogEnd, FogColor);
}