Differences

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--- 0.8.4:default-material [2022/06/27 11:13] – [TGorillaGlobalsNode (Globals)] admin
+++ 0.8.4:default-material [2023/01/31 14:07] (current) – [Changing Shaders at DesignTime] admin
@@ Line 1346: / Line 1346: @@
+==== Changing Shaders at DesignTime ====
+Since 0.8.4 it's possible to modify your default shader at designtime, by using published properties *VertexShader* or *SurfaceShader*.
+Simply select your default material source, go to object inspector and open the text editor of the property. An empty GLSL function should be visible depending on the shader used.
+For VertexShader:
+<file glsl>
+void VertexShader(inout TLocals DATA){
+}
+</file>
+For SurfaceShader (Fragment/Pixel-Shader):
+<file glsl>
+void SurfaceShader(inout TLocals DATA){
+}
+</file>
+You can then modify or extend the shader functionality.
+Please have a look a the section [[#tgorillaglobalsnode_globals|Shader-Variables]] for the available fields in TLocals structure.
+**NOTICE:** //Modifying the vertex position in vertex-shader all 3 fields "DATA.Position", "DATA.TransfVertexPos" and "DATA.WorldViewProjVertPos" need to be modified. Otherwise their basis might not be equal which leads to unexpected effects!//
+In the following example we've created a wobbling effect in the vertex shader:
+<file glsl>
+vec2 DELPHI_HASH2(vec2 n){
+    return fract(sin(n)*1399763.5453123);
+}
+float DELPHI_NOISE(vec2 st){
+    vec2 i = floor(st);
+    vec2 f = fract(st);
+    vec2 u = f * f * (3.0 - 2.0 * f);
+    float a = dot(DELPHI_HASH2(i + vec2(0.0,0.0)), f - vec2(0.0, 0.0));
+    float b = dot(DELPHI_HASH2(i + vec2(1.0,0.0)), f - vec2(1.0, 0.0));
+    float c = dot(DELPHI_HASH2(i + vec2(0.0,1.0)), f - vec2(0.0, 1.0));
+    float d = dot(DELPHI_HASH2(i + vec2(1.0,1.0)), f - vec2(1.0, 1.0));
+    return mix(mix(a, b, u.x), mix(c, d, u.x), u.y);
+}
+vec3 DELPHI_WOBBLE(vec3 pos, float time, float intensity){
+    return vec3(pos.x, pos.y + (DELPHI_NOISE(vec2(pos.x, pos.z) + time) * intensity), pos.z);
+}
+void VertexShader(inout TLocals DATA){
+  DATA.Position.xyz = DELPHI_WOBBLE(DATA.Position.xyz, _TimeInfo.y, 0.5);
+  DATA.TransfVertexPos = _ModelMatrix * DATA.Position;
+  DATA.WorldViewProjVertPos = _ModelViewProjectionMatrix * DATA.Position;
+}
+</file>
 ===== Properties =====