More Tesselation Detail

Hi, I am trying to add more detail to a tesselated grid, which has a heightmap applied to it.
Basically, changing the tesselation factor to greater than 80.0f doesn’t result in more visible detail.

Here are my two shaders:

Tesselation Control Shader:

# version 430

layout (vertices = 3) out;
uniform float tessLevel = 1000.0f; //Changing this to 1000.0f looks exactly the same as 80.0f

void main (){
  gl_out[gl_InvocationID].gl_Position = gl_in[gl_InvocationID].gl_Position;
  gl_TessLevelOuter[0] = tessLevel;
  gl_TessLevelOuter[1] = tessLevel;
  gl_TessLevelOuter[2] = tessLevel;
  gl_TessLevelInner[0] = tessLevel;

Tesselation Evaluation Shader:

# version 430

layout (location=0) uniform sampler2D heightMap;
layout (triangles, equal_spacing) in;

uniform mat4 modelWorld;

void main (){
  vec3 p0 = gl_in[0] * gl_TessCoord.x;
  vec3 p1 = gl_in[1] * gl_TessCoord.y;
  vec3 p2 = gl_in[2] * gl_TessCoord.z;
  vec3 position = p0 + p1 + p2;
  float height = texture(heightMap, vec2(position.x/1024.0f, position.z/1024.0f)).x;
  position.y += height * 200;
  gl_Position = modelWorld * vec4(position, 1.0f);

You can’t add more details that way. Read the value of GL_MAX_TESS_GEN_LEVEL and you’ll find out what is the limit of your hardware. For all known hardware it is “only” 64 by now. How have you achieved 80?

Awesome thanks, I didn’t really know what value it stopped tesselation, just took a stab at around 80ish

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